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The relationship between valence electrons and the group number for main group elements is that:

The group number is equal to the number of valence electrons (for Groups 1, 2, and 13-18, often ignoring the '10' for the latter).

The group number is always half the number of valence electrons.

The group number indicates the total number of electrons.

There is no relationship.

Which of the following is the electronic configuration of a Group 2 element?

2, 8, 7.

2, 8, 2.

2, 8, 1.

2, 1.

An atom has 7 electrons in its outermost shell and 3 occupied electron shells. What element is it?

Sulfur.

Oxygen.

Chlorine.

Bromine.

How many electrons can the first energy level (n=1) hold?

32.

18.

Halogens are located in which group of the Periodic Table?

Group 1.

Group 18.

Group 2.

Group 17.