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Question

An element is represented by ZXA, where Z is atomic number which is also equal to number of proton, A is mass number and X is symbol of the element.
Mass number (A) = Number of protons (Z) + Number of neutrons.
Isotopes: Atoms having same number of proton
Isobar: Elements having same mass number
Isotones: Elements having same number of neutron (A-Z)

An isotone of 9040Zr is _________.

A
8636Kr
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B
3919K
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C
8035Br
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D
11950Sn
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Solution

The correct option is A 8636Kr
Isotones are species that have the same number of neutrons but different number of protons.
Number of neutrons = mass number – atomic number
Number of neutrons in 9040Zr=90 40=50

Number of neutrons in 8636Kr=86 36=50
Number of neutrons in 3919K=39 19=20
Number of neutrons in 8035Br=80 35=45
Number of neutrons in 11950Sn=11950=69

Therefore, 8636Kr is an isotone of 9040Zr.

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