Question

for groups 1, 2 and 13 - 18 on the periodic table, we can easily tell how many valence electrons an element has based on the _. options: period number, number in the ones place of the group number, you cannot tell by the group number, number in the tens place of the group number complete this quiz to finish the assignment for chemistry - p8 due on oct 2, 2025. report an error. question 5 of 5

Explanation:

Step1: Recall periodic - table group - valence electron relationship

For groups 1, 2 and 13 - 18 on the periodic table, the number of valence electrons of an element can be determined from the group number. For groups 1 - 2, the number of valence electrons is equal to the ones - place digit of the group number. For group 13, there are 3 valence electrons, group 14 has 4, group 15 has 5, group 16 has 6, group 17 has 7 and group 18 has 8 (except helium which has 2).

Answer:

number in the ones place of the group number