Question

Two atoms having the same number of proton and electron but different number of neutorn

Answer 1

these type of elements are called isotopes they have the same atomic no but different mass no . for example
hydrogen isotopes
protium , deutrium , tritium they have mass numbers 1,2,3 respectively but they the same atomic no
because they have same atomic no they have identical properties .

Answer 2

It can be also be term as "Isotopes"which means having same atomic no. but different mass number.

1.) Hydrogen

2.) oxygen

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