Atoms MCQs with Answers

Atom which loses two electrons from its outer shell to form ion is called?

• A.Sodium
• B.Magnesium
• C.Chlorine
• D.Potassium

Total charge on electron is?

• A.+9.1 × 10⁻³¹ C
• B.+1.6 × 10⁻¹⁹ C
• C.–9.1 × 10⁻³¹ C
• D.–1.6 × 10⁻¹⁹ C

Which particle is present in all atomic nuclei?

• A.Electron
• B.Proton
• C.Neutron
• D.Positron

When one beta particle is emitted from the nucleus of an atom, the _?

• A.Atomic number increases by 1
• B.Atomic number decreases by 1
• C.Mass number increases by 1
• D.Mass number decreases by 1

Oxygen atom contains 8 protons, 8 electrons and neutrons.

• A.6
• B.8
• C.10
• D.12

In an atom, the number of protons and neutrons are added to obtain ?

• A.Atomic number
• B.Mass number
• C.Number of nucleons
• D.Isotopic number

When 2 alpha particles are emitted from ₁₀Ne²², what will be the daughter element?

• A.Oxygen
• B.Carbon
• C.Beryllium
• D.Nitrogen

Oxygen belongs to group VIA so number of electrons in its valence shell are _?

• A.4
• B.6
• C.8
• D.2

The mass of a neutron is nearly same as that of _?

• A.An alpha particle
• B.An electron
• C.A proton
• D.A positron

When two negative beta particles are emitted from a nucleus then the mass number _?

• A.Increases by 2
• B.Decreases by 2
• C.Remains the same
• D.Decreases by 4