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.

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.

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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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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the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.