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)its group number
D)eight
E)eight minus the group number

Question

Quizplus · Accepted Answer

Group A elements have valence electrons equal to their group number, which is the number of electrons in the outermost energy level. So, for example, a Group A element in Group 2 has 2 valence electrons, and a Group A element in Group 7 has 7 valence electrons. Therefore, the number of valence electrons found in an atom of a Group A element is equal to its group number.

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