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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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