Question

18. State the Modern Periodic Law.
19. Answer the following questions with respect to the Modern Periodic Table:
a. How many groups are there in the Periodic Table?
b. How many columns are there in the Periodic Table?
c. What are Group 1 elements called?
d. What are Group 2 elements called?​

Answer 1

Answer:

18) The physical and chemical properties of an element are the periodic function of the atomic number.

19a) 18 groups

b) 18 columns(since columns and groups are same)

c) alkali metals

d) alkaline earth metals

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Answer 2

18) The physical and the chemical properties of an element is the periodic function is Atomic Number .

19) Answers :-

1. 18 Groups
2. 7 Columns
3. Alkali Elements
4. Alkali - Earth Elements