Atoms MCQs with Answers

Which particle has no charge?

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

If an atom has 2 protons, 2 electrons, and 1 neutron, its atomic mass will be ?

• A.2
• B.4
• C.3
• D.5

An atom is neutral but when an atom or molecule carries a net electric charge due to gain or loss of an electron, it is called an?

• A.Isotope
• B.Free radical
• C.Isomer
• D.Ion

An isotope is _?

• A.An atom with the same atomic mass but different atomic number
• B.An atom with the same number of neutrons but different number of protons
• C.An atom with the same number of electrons but different number of protons
• D.An atom with the same number of protons but different number of neutrons

What is the process of splitting the nucleus of an atom into smaller units?

• A.Fission
• B.Fusion
• C.Radioactivity
• D.Ionization

Shielding effect across the periods is?

• A.Increases
• B.Decreases
• C.Remains constant
• D.First increases then decreases

Past Paper MCQ

What is the name of the uncharged particle found in an atom?

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

The concept of an atom with central nucleus was introduced/discovered by _?

• A.John Dalton
• B.J.J. Thomson
• C.Niels Bohr
• D.Rutherford

Atomic mass of an element is equal to ?

• A.Mass of electrons only
• B.Mass of protons and neutrons
• C.Mass of protons and electrons
• D.Mass of neutrons and electrons

The spectrum of He is expected to be similar to that of ?

• A.Be
• B.H
• C.Na+
• D.Li+