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Which pair below describes isotopes of the same element?
A) an atom with 6 protons and 8 neutrons - an atom with 8 protons and 6 neutrons
B) an atom with 6 protons and 6 neutrons - an atom with 6 protons and 7 neutrons
C) an atom with 8 protons and 8 neutrons - an atom with 7 protons and 8 neutrons
D) an atom with 7 protons and 6 neutrons - an atom with 6 protons and 6 neutrons
8)

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Answer: B

Explanation:

For exhibit isotopy, atoms of the element must have the same proton number (atomic number) but different mass number.

In Option B

The two atoms have same atomic number (6) but different mass number (12 and 13 respectively).

Mass num = proton number + Neutron number

Unlike the other options.

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