Question

13
6
19.
Ch
7. The following are some statements about modern periodic table
i) It is based on electronic configuration
ii)It contains 7 periods and 18 groups
iii)Each period begins with a non - metallic element
1) All are correct 2) only i and ii are correct
3) only i is correct 4) only ii and iii are correct​

Answer 1

Answer:

3 option is correct.

thanks