Atoms MCQs with Answers

One-liner

The word "atom" is derived from the Greek word Atomos, meaning "indivisible" or "uncuttable."

One-liner

An atom is the smallest possible particle of an element that retains its chemical properties and can combine to form new compounds.

One-liner

The relative atomic mass of Hydrogen (H) is 1.00794 atomic mass units (amu).

One-liner

The shielding effect decreases across a period because the increasing nuclear charge pulls electrons closer without adding new shells.

One-liner

If the proton number is 19, the electron configuration is 2, 8, 8, 1.

One-liner

The sum of the masses of constituent nucleons is greater than the mass of the resultant nucleus, meaning the resultant nucleus is smaller in mass.

One-liner

In Bohr's model, an electron emits or absorbs energy only when it jumps from one energy level to another.

One-liner

Nitrogen (N) has the largest ionization energy among N, P, As, and Sb because ionization energy decreases down a group in the periodic table.

One-liner

The nucleus of the Protium isotope contains 1 proton.

One-liner

An element with seven electrons in its valence shell has a valency of 1, as it needs only one more electron to complete its octet.