First slide

Atomic number, mass number, isotopes, isobars and isotones

Question

$X^{3 -}$ is iso electronic with Argon. It has electrons and neutrons in equal number. The mass number of ‘X’ is

Easy

A

30
B

31
C

32
D

33

Solution

$X^{- 3} = Ar = 18 e^{-}$ , ‘X’ has 15 p
$∴$ Mass number = p + n = 15 + 18 = 33

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