) How many periods and groups are present in the periodic table?
A. 7 periods and 18 groups
B. 8 periods and 7 groups
C. 7 periods and 7 groups
D. 8 periods and 8 groups
Answer:A
) How many periods and groups are present in the periodic table?
A. 7 periods and 18 groups B. 8 periods and 7 groups C. 7 periods and 7 groups D. 8 periods and 8 groups