4. STRUCTURE OF THE ATOM
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यदि तत्व का $Z =3$ हो तो तत्व की संयोजकता क्या होगी ? तत्व का नाम भी लिखिए।

A

हाइड्रोजन

B

बेरियम

C

हीलियम

D

लिथियम

Solution

By $Z=3$, we mean that the atomic number of the element is $3$ . Its electronic configuration is $2,1 .$

Hence, the valency of the element is $1$

(since the outermost shell has only one electron).

Therefore, the element with $Z =3$ is lithium.

Standard 9
Science

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