How many valance electrons do atoms in group 1 group 2 and groups 15 to 17 have?

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group1: +1
group2: +2
group15: -3
group16: -2
group17: -1
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Why do atoms of group 1 elements lose electrons to form cations where as atoms of group 17 elements gain electrons to form anions?

By doing so, both end up having a noble gas configuration, with 8 valence electrons (known as an octet). They do this to become chemically stable. They become stable as they h

How do the outer-shell electron configurations for ions of elements from groups 1 and 2 and 15 and 16 and 17 compare with those of the noble gases?

Answer . Elements in Group 1 have 1 more electron than the noble gas in the row above it. Elements in Group 2 have 2 more electrons than the noble gas in the row above it

How many valance electrons are in the A group?

Group One on the periodic table consists of. Li - Lithium . Na - Sodium . k - Potassium . Rb - Rubidium . Cs - Cesium . All of these elements all have plus one (+1) val

Why groups 1 and 2 form many compounds with groups 16 and 17?

Group 1 and 2 elements have 1 and 2 valence electrons respectively. Removal of these electrons will result in stable noble gas electronic configuration. Group 17 and 16 elemen