Question

An atom differs from it's ion in which among the following?
a). Mass no.
b)-Atomic no
c) Neutrons
d) No. of protons​

Answer 1

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Atoms and Ions

Atoms lose or gain electrons to form ions

• If they gain electrons,the electrons are more in number increasing the negative charge on the atoms ( Anions)

• If they lose electrons,the no.of electrons decrease inturn increasing the positive charge (Cations)

Properties of electrons

• Their mass is negligible

• They determine the chemical behavior of atoms

The atoms differ with an ion in its Mass number

Eliminating other options

• Option B : Atomic Number

An ion would have the same atomic number as its parent atom

• Option C : Neutrons

Neutrons are found in the nucleus of atom. They don't help in formation ions though. They are a constant for both atoms and ions

• Option D : Protons

Similarly,number of protons don't change during formation of ions

Thus,Option A is correct