Question

Which of the following statement about the Mendeleev’s periodic table is correct? (a) It has 8 vertical columns known as groups. (b) It has 18 horizontal rows known as periods. (c) It has 7 horizontal rows known as groups (d) It has 18 vertical columns known as period

Answer 1

Answer:

option b i think

Explanation:

Answer 2

Answer:

a

Explanation:

That is the answer because it is given in chemistry reference book