Periodic Table
The Periodic Table is a tabular arrangement of the elements in increasing order oftheir atomic numbers, so that elements with similar properties are in the same column. There are 18 columns, called groups, and seven rows, which are called periods, in the modern periodic table. Questions about the Periodic Table: its history and creation, trends, groups/families, and periods are asked in our Periodic Table category.
Total questions 56600
Follow
ID1847690273
added How is the alkali metal family different from all other families on the periodic table to Periodic Table 26 May 2012 09:59
ID1977785710
added Reason of position of Gr. VIII of the periodic table to Periodic Table 26 May 2012 07:37
ID2057459445
wrote the first answer to What is the periodic element for krypton 26 May 2012 05:43
Vigorouschemist [2]
wrote the first answer to What is a common property of metals 26 May 2012 04:01
Answers
Vigorouschemist
Waterfire123
Cope87
GRALISTAIR
Meave60
Edits
Vigorouschemist
Theprismgroup
GRALISTAIR
Emrey35
Cope87
Organization
Deb
GRALISTAIR
Dfoofnik
Desdichado
Vigorouschemist
Questions
Angela Lulu
Amber Belle
Vbeav1
Maria suarez
Mflatt
Community
AlijanaliFe - Steel 500 - Its grade (i.e., the yield stress - 500 N/mm2 )
Popularity: 201 • Tools: Recategorize
C2H4O2 or CH3COOH, 60.05 g/mol C has a weight of 12 (x 2) = 24 grams H has a weight of 1 (x 4) = 4 grams O has a weight of 16...
Popularity: 150 • Tools: Recategorize
I never thought I'd see the day where I answer a question here. tin(IV) has a positive four charge. selenide usually forms a...
Popularity: 143 • Tools: Recategorize
Commonly, 67. There are isotopes that vary from this. See related link.
Popularity: 141 • Tools: Recategorize
they make them in lots of places and they don't usually have a specific factory as they are relatively easy to make. You can look...
Popularity: 139 • Tools: Recategorize
Lithium (Li), with a Mohs hardness of 0,6.
Popularity: 139 • Tools: Recategorize
Coloured salts generally have a cation which is a transition metal. Iron, Chromium, Manganese, Vanadium and Copper all are...
Popularity: 138 • Tools: Recategorize
Protons.
Popularity: 137 • Tools: Recategorize
The chemical symbol Ag is from the Latin for "silver", argentum.
Popularity: 137 • Tools: Recategorize
It depends on your school system. Usually 5th grade, 8th grade and 11th grade.
Popularity: 137 • Tools: Recategorize
He made the first periodic table by taking the elements he knew, and arranging them according to atomic mass. He then discovered...
Popularity: 135 • Tools: Recategorize
Americium was first obtained by Glenn T. Seaborg, Leon O. Morgan, Ralph A. James and Albert Ghiorso in 1944 (University of...
Popularity: 134 • Tools: Recategorize
Adhesives are no longer made from animal parts. - - - - -Not true--you can still buy hide glue from woodworking stores. The...
Popularity: 133 • Tools: Recategorize
None of the above. Silver chloride is a compound, while there terms metal, nonmetal, and metalloid apply to elements.
Popularity: 133 • Tools: Recategorize
The work for this would be 118.96 grams per mole of tin, then divide that number by avogadro's number, 6.022x10^23.
Popularity: 133 • Tools: Recategorize
Lead(II) Sulfide = PbS Lead(IV) Sulfide = PbS2
Popularity: 132 • Tools: Recategorize
There is 113 is Ununtrium and 115 is Ununpentium however they are not well known like other elements.
Popularity: 131 • Tools: Recategorize
I believe they are arranged by their density but I am not sure completely. Actually every element is arranged by atomic number...
Popularity: 131 • Tools: Recategorize
Radium, the 88th element
Popularity: 131 • Tools: Recategorize
Aluminum, atomnumber 13 (because 2+8+3 = 13), has the 2, 8, 3 electron configuration
Popularity: 131 • Tools: Recategorize
Metal or alloykg/cu.maluminum - melted2560 - 2640aluminum bronze (3-10% Al)7700 - 8700aluminum foil2700 -2750antifriction...
Popularity: 130 • Tools: Recategorize
He first thought about using the atomic mass, but found out that way caused problems with organization. Later, he organized it by...
Popularity: 130 • Tools: Recategorize
Holmium actually has the highest magnetic strength out of all known elements given it is first submersed in an artificially...
Popularity: 129 • Tools: Recategorize
It is an essential constituent of protoplasm, used in safety matches, pyrotechnics, incendiary shells, and fertilizers and to...
Popularity: 129 • Tools: Recategorize
Beryllium, magnesium, calcium, strontium, barium, and radium.
Popularity: 129 • Tools: Recategorize
lawrencium is the element,Actually, it's curium, named after Marie Curie
Popularity: 128 • Tools: Recategorize
Density: 8.57 Grams Per Cubic Centimeter
Popularity: 128 • Tools: Recategorize
The easiest way is buy it from a chemical supply house. However this is a very dangerous spontaneously flammable element and may...
Popularity: 128 • Tools: Recategorize
I'm going to rewrite that as CH3LiCO2 also known as Lithium acetate. It's molar mass is 65.99 g/mol which I just looked up at the...
Popularity: 127 • Tools: Recategorize
1 mg = 0.00220462 pounds
Popularity: 127 • Tools: Recategorize
uranium-326 it would be so unstable and radioactive its half life would be far less than a microsecond. i am sure none of this...
Popularity: 126 • Tools: Recategorize
Hydrogen and oxygen.
Popularity: 126 • Tools: Recategorize
yes. group 1 is the most reactive. as the group number increases, its reactivity decreases.
Popularity: 126 • Tools: Recategorize
The formula given is correct for any of the octyl alcohols, also called octanols.
Popularity: 126 • Tools: Recategorize
It is an abbreviation of plumbum, the latin name for lead.
Popularity: 125 • Tools: Recategorize
I would not call osmium strong, because it is very problematic. Howeverit is very heavy - may be the heaviest
Popularity: 125 • Tools: Recategorize
The only disadvantage I can think of is that tou should NOT swallow it. Trust me : (
Popularity: 124 • Tools: Recategorize
Different reactions require different solvents. Sometimes the polarity of H2O can hinder the progression of the reaction by...
Popularity: 124 • Tools: Recategorize
The name comes from the daughter of Tantalus: NiobeIt was discovered in 1801 from England by a guy named Charles HatchettNiobium...
Popularity: 123 • Tools: Recategorize
The Latin name for Potassium is Kalium; that's why it's symbol is Ka.
Popularity: 123 • Tools: Recategorize
The mass numer of Indium is 115. This is so because the atomic number is 114.82 and in order to get 115 you round to the nearest...
Popularity: 122 • Tools: Recategorize
No, mica is a metamorphic rock. It is an excellent high voltage insulator.
Popularity: 122 • Tools: Recategorize
The periodic table is never complete because people/scientists find or make new elements, so the periodic table keeps on getting...
Popularity: 122 • Tools: Recategorize
Lithium-6 and lithium-7 are two different isotopes of lithium. All lithium atoms have 3 protons, but they may have different...
Popularity: 122 • Tools: Recategorize
The symbol for carbon monoxide is CO. Carbon monoxide contains one carbon atom (C) and one oxygen atom (O).
Popularity: 121 • Tools: Recategorize
Group 8 is comprised of Iron (No. 26), Ruthenium (No. 44), Osmium (76), and Hassium (108). They're one of the groups of...
Popularity: 121 • Tools: Recategorize
Rubbing alcohol consists of a mixture of isopropyl alcohol (also called 2-propanol), or C3H8O, and water.
Popularity: 121 • Tools: Recategorize
it is used for jewelry and utensils<><><>Silver is also the best known electrical conductor.
Popularity: 120 • Tools: Recategorize
alkaline earth metals
Popularity: 120 • Tools: Recategorize
You probably wonder why hydrogen belongs to the first group while the second element, helium, in the periodic table belongs the...
Popularity: 120 • Tools: Recategorize
Lead has many uses just a few are as weights, fishing weights, and bullets. It was formerly used in gasoline and paint. It is...
Popularity: 119 • Tools: Recategorize
Mercury only has a two and one oxidation state. HgO would be the formula for mercury II oxide.
Popularity: 119 • Tools: Recategorize
Dmitri Ivanovic Mendeleev
Popularity: 119 • Tools: Recategorize
Depending on concentration: above 0.01 M HCl it can be quite irritant. Concentrated above 1 M is very toxic, fuming, acute...
Popularity: 118 • Tools: Recategorize
IO- is not an element it is a compound. The compound represented by IO is Hypoiodite. I=iodine O=oxygen The negative represents...
Popularity: 117 • Tools: Recategorize
it is credited to Dmitri Mendeleev!
Popularity: 117 • Tools: Recategorize
Because it tends to gain an electron when it bonds, while hydrogen tends to loose one.
Popularity: 117 • Tools: Recategorize
You may be referring to the elements whose symbols do not match their names. Such symbols refer to names for those elements (or...
Popularity: 115 • Tools: Recategorize
It is not on the periodic table because all a cation is, is the positively charged Element in a compound. The periodic table...
Popularity: 115 • Tools: Recategorize
Good conductors of heat Good conductors of electricity Ductile Malleable Unreactive but form alloys High melting points (except...
Popularity: 114 • Tools: Recategorize
The person who answered this before is stupid. It's a positive charge because every nucleus is made up of neutrons (neutrual) and...
Popularity: 114 • Tools: Recategorize
1. Naturally astatine is found in the decay series of uranium, thorium and actinium. 2. Artificially astatine is prepared by...
Popularity: 113 • Tools: Recategorize
the number of protons in it's nucleus.
Popularity: 113 • Tools: Recategorize
highly Radioactive and weakly basic actinide
Popularity: 112 • Tools: Recategorize
Uranium, Neptunium and Plutonium follow each other - elements 92,93,94. They are named after the outer planets though Pluto is no...
Popularity: 111 • Tools: Recategorize
It was discovered in what is modern day Russian.
Popularity: 109 • Tools: Recategorize
Hydrogen, Helium, Nitrogen, Oxygen, Fluorine, Neon, Chlorine, Argon, Krypton, Xenon, Radon. Take your pick.
Popularity: 108 • Tools: Recategorize
The 7th element is Nitrogen.
Popularity: 107 • Tools: Recategorize
The most common container in practice is a gas-discharge lighting unit that has a red light color. The most common natural source...
Popularity: 104 • Tools: Recategorize
There are several ways to store tritium. It can be stored as a gas for short term storage (as in nuclear weapons -- the gas in...
Popularity: 103 • Tools: Recategorize
Name: Roentgenium Symbol: Rg Atomic number: 111 Atomic weight: [ 280 ]
Popularity: 103 • Tools: Recategorize
Counting Valence Electrons The number of valence electrons is just how many electrons an atom has in its outer shell. It's easy...
Popularity: 101 • Tools: Recategorize
Trimethylindium is extremely reactive towards oxygen and water. With low concentrations of oxygen (ppb to ppm to a few %), it...
Popularity: 101 • Tools: Recategorize
Physical Change:*Milo dissolves into hot milk*A plate is dropped and shatters*Grass in mowed*Metal Knife is sharpened*Breakfast...
Popularity: 101 • Tools: Recategorize
Beryllium metal is an electrical and thermal conductor. Beryllia, the ceramic of beryllium, is a thermal conductor and an...
Popularity: 100 • Tools: Recategorize
The Periodic TableDmitri Mendeleev created the first periodic table according to atomic mass in 1869. Others before Mendeleev had...
Popularity: 98 • Tools: Recategorize
Tellurium is radioactive, though there are stable isotopes. The radioactive isotopes found in nature account for more than two...
Popularity: 93 • Tools: Recategorize
Before writing a chemical reaction, you must know a few things. You must know what the reactants are, and what the molecular...
Popularity: 91 • Tools: Recategorize
There are over 20 million known compounds. There are over 100 billion possible compounds containing only H, C, O and N. It would...
Popularity: 91 • Tools: Recategorize
The element Mg is in the 3rd period of the periodic table.
Popularity: 91 • Tools: Recategorize
The atomic number of Copper (Cu) is 29.0. See the Web Links for more information about copper to the left of this answer.
Popularity: 90 • Tools: Recategorize
They are arranged in ascending order by proton number. There are eight vertical groups. Elements in each group share similar...
Popularity: 90 • Tools: Recategorize
