Answered

Two atoms appear to have the same mass number. These atoms

Amust have the same atomic number.
Bmust have the same number of electrons.
Cmust have the same chemical properties.
Dmust have the same number of protons + neutrons.
Emust have the same atomic number, the same number of protons + neutrons, the same number of electrons, and the same chemical properties.

Verified Answer :

The atoms should onky have same no. of protons+electrons.

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