Question

question 5 of 10
what property of an element does the group number identify in a numbering system that uses \a\ and \b\?

a. the electrons closest to the nucleus
b. the number of valence electrons
c. the number of core electrons
d. the number of inner electrons

Explanation:

In the A - B numbering system for groups of elements (used in some periodic table numbering), the group number (for A groups) identifies the number of valence electrons an element has. Option A is incorrect as electrons closest to the nucleus are core electrons, not identified by group number. Option C and D are incorrect because core or inner electrons are not identified by the group number in this system; the group number (A groups) relates to valence electrons.

Answer:

B. The number of valence electrons