Question

11) check whether they are triads or not
Group Elements and their atomic weight
A Lithium Sodium (Na) Potassium
(LI) (23.0)
(K)
(7.0)
(39.0)
B
Calcium
(Ca)
(40.0)
Strontium(Sr) Barium
(87.5)
(Ba)
(137.0)​

Answer 1

11) check whether they are triads or not

Group Elements and their atomic weight

A Lithium Sodium (Na) Potassium

(LI) (23.0)

(K)

(7.0)

(39.0)

B

Calcium

(Ca)

(40.0)

Strontium(Sr) Barium

(87.5)

(Ba)

(137.0)