Atoms MCQs with Answers

The kinetic energy of an electron in the nth orbit is _?

• A.1/2 mv²
• B.1/2m Vn²
• C.m Vn²
• D.1/2m Vn

Neutron was discovered by?

• A.Ernest Rutherford
• B.J.J. Thomson
• C.James Chadwick
• D.Niels Bohr

A radioactive element emits a particle from the nucleus of one of its atoms. The particle comprises two protons and two neutrons. The name of this process is called?

• A.β-emission
• B.α-emission
• C.γ-emission
• D.Positron emission

The atoms ³¹₁₅P and ³²₁₆S have the same _?

• A.Number of protons
• B.Mass number
• C.Number of neutrons
• D.Atomic number

Alpha particles are identical to ?

• A.Hydrogen nuclei
• B.Helium nuclei
• C.Electrons
• D.Neutrons

The daughter nucleus after α-decay of ₆C¹⁰ will be ?

• A.₈O⁶
• B.₅B¹⁰
• C.₇N⁶
• D.₄Be⁶

Which statement about one mole of metal is always correct?

• A.It contains the same number of atoms as 1 mole of hydrogen atoms.
• B.It has the same mass as 1 mole of hydrogen atoms.
• C.It occupies the same volume as 1 mole of hydrogen atoms.
• D.It has the same density as 1 mole of hydrogen atoms.

The electrons that have been knocked out of the outermost shell of an atom are known as?

• A.Valence electrons
• B.Free electrons
• C.Core electrons
• D.Bound electrons

Which shell has 3 subshells?

• A.K shell
• B.L shell
• C.M shell
• D.N shell

What is the maximum number of electrons the M orbit can possess?

• A.8
• B.32
• C.18
• D.2