Question

match the group number of the main group elements (or sequence number on some periodic tables) with the corresponding number of valence electrons. note: valence electrons for transition metals are omitted due to the presence of additional d subshell electrons. group number 1a 2a 3a 4a(14) 5a(15) 6a(16) 7a(17) 8a(18) number of valence electrons: group number number of valence electrons: 1a choose 2a choose 4 5 3 1 8 6 2 7 3a 4a(14) 5a(15) choose

Explanation:

For main - group elements, the number of valence electrons is equal to the last digit of the group number (in the A - group numbering system). Group 1A elements have 1 valence electron, Group 2A have 2, Group 3A have 3, Group 4A (14) have 4, Group 5A (15) have 5, Group 6A (16) have 6, Group 7A (17) have 7, and Group 8A (18) have 8 (except helium which has 2).

Answer:

Group Number	Number of Valence Electrons
2A	2
3A	3
4A(14)	4
5A(15)	5
6A(16)	6
7A(17)	7
8A(18)	8