1.Name an atom whose nucleus does not contain neutrons.
2.An atom has 9 protons,9electrons and 10 neutrons.what is the symbolof the element.

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Solution

Protium is one isotope of hydrogen which does not contains neutron.
Fluorine, F

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(e) The shell closest to the nucleus of an atom.

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Helium atom has an atomic mass of 4 u and two protons in its nucleus. How many neutrons does it have?

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