Question

Consider the following elements: Na, Ca, Al, K, Mg and Li.

(a) Which of these elements belongs to the 3rd period of the modern periodic table?

(b) Which of these elements belong to Group 1 of the modern periodic table?

(c) Which of these elements show a valency of +3?

Answer 1

a=Na ,Al and Mg

b=Na and K

c=Al