Match the columns: Column I - (1) Modern periodic table, (2) Vertical columns, (3) Halogen, (4) Smallest period

Question

Match the columns:

Column I	Column II
(1) Modern periodic table	(a) Group 17
(2) Vertical columns	(b) Period 2
(3) Halogen	(c) Atomic number
(4) Smallest period	(d) Group
	(e) Period 3

Answer 1

(1) Modern periodic table – Atomic number 

(2) Vertical columns Group 

(3) Halogen – Group 17 

(4) Smallest period – Period 2.