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Three elements Q, R and T have mass numb...

Three elements Q, R and T have mass number 40. Their atoms contain 22, 21 and 20 neutrons, respectively. Represent their atomic composition with appropriate symbol.

Text Solution

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A = Z + N `therefore` Z = A - N
For the given three elements A = 40. Values of their atomic numbers Z, are obtained from the given values of neutron numbers, N, using the above expression.
for Q : Z = A - N = 40 - 22 = 18
for R : Z = A - N = 40 - 21 = 19
for T : Z = A - N = 40 - 20 = 20
`therefore` The atomic composition of the three elements is written as follows :
`""_(18)^(40)Q,""_(19)^(40)R,""_(20)^(40)T`
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