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  4. The atomic masses of Li and K are 7 and 39, respectively. According to law of triads the atomic mass of Na will be

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Q. The atomic masses of $Li$ and $K$ are $7$ and $39,$ respectively. According to law of triads the atomic mass of $Na$ will be

NTA AbhyasNTA Abhyas 2020Classification of Elements and Periodicity in Properties

Solution:

Atomic mass of middle element of triad is equal to average of masses of terminal elements.

$Li$ Na $K$

$7 \, 23 \, 39 \, \frac{7 + 39}{2}=23$