# The atomic masses of three elements A, B and C having similar chemical properties are 7, 23 and 39, respectively - Science and Technology 1

The atomic masses of three elements A, B and C having similar chemical properties are 7, 23 and 39, respectively.

1. Calculate the average atomic mass of elements A and C.
2. Compare the average atomic mass with atomic mass of B.
3. What could the elements A, B and C be?

#### Solution

(a) The average atomic mass of elements A and C = (7+39)/2=46/2=23

(b) The average atomic mass of elements A and C is equal to the atomic mass of element B.

(c) A is lithium, B is sodium and C is potassium.

Concept: Periodic Properties
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