An element by definition refers to all atoms with the same number of protons; so any atom with 1 proton is the same element as all other atoms with one proton; which would be helium. And then, all...
Yes, if you want to get technical about it.
'Velocity' is a quantity that has both magnitude (size) and direction. The magnitude of the velocity is what we call the speed. Strictly speaking, you can...
An isotope is simply a certain element with a different atomic mass, for example carbon 12 is the same element as carbon 13 because it has the same number of protons, but it has an atomic mass of 12...