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Question

A atom M have 82 protons, 126 neutrons and 82 electrons, another species N contain 82 protons, 126 neutrons and 80 electrons, then N is a :

A
isotope of M
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B
isotone of M
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C
isobar of M
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D
dispositive cation of M
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Solution

The correct option is D dispositive cation of M
M=82Pb208 and N=Pb+2

Two nuclides are isotones if they have the very same neutron number N, but different proton number Z.

Isobars differ in atomic number (or number of protons) but have the same mass number.
Here both M and N have equal number of proton and neutron but M contains more electrons than N thus N must be the cation of M.

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