From the periodic table, the number of valence electrons for most of the main group elements may be determined directly from the From the periodic table, the number of valence electrons for most of the main group elements may be determined directly from the atomic number. group number. period number. nucleon number.

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znk znk · Answer 1 · 2018-09-16T01:15:39+02:00

You can determine the number of valence electrons (VE) for main group elements directly from the Group number.

For the s-block, VE = Group No.

For the p-block, VE = Group No. - 10

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Abdulazeez10 Abdulazeez10 · Answer 2 · 2021-09-30T16:40:03+02:00

The number of valence electrons for most of the main group elements may be determined directly from the group number

First we will define what is meant by valence electrons.

Valence electrons are those electrons that reside in the outermost shell surrounding an atomic nucleus.

The number of valence electrons for most of the main group elements may be determined directly from the group number. For example, all the elements in group-1 have one (1) valence electron in their outermost shell.

Atomic number which is also known as proton number is the number of protons found in the nucleus of every atom of that element.

Period number is related to the number of electron occupied shells in the element.

Nucleon number which is also known as mass number is the sum of the number of neutrons and protons in an atomic nucleus.

Hence, the number of valence electrons for most of the main group elements may be determined directly from the group number.

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