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4. STRUCTURE OF THE ATOM
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If $Z = 3$, what would be the valency of the element? Also, name the element.
A
hydrogen
B
berium
C
helium
D
lithium
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
