The number of valence electrons found in an atom of a Group A element is equal to
A)its atomic number.
B)its mass number.
C)eight minus the group number.
D)eight.
E)its group number.

Question

Quizplus · Accepted Answer

The number of valence electrons in an atom of a Group A element is equal to its group number. This is because the group number represents the number of electrons in the outermost energy level (or valence shell) of the atom. For example, Group 1 elements have 1 valence electron, and Group 7 elements have 7 valence electrons.

The Number of Valence Electrons Found in an Atom of a Group