An atom of an element differs from the atom of another element in terms of

• Number of electrons

• Number of protons

• Number of neutrons

• Sum of number of protons and neutrons

Mass number is the sum of

• Atoms and molecules

• Electrons and protons

• Protons and neutrons

• Electrons and neutrons

The process by which particles in gas phase converts to liquid phase is known as

• Diffusion

• Evaporation

• Liquefaction

• Condensation

The process whereby particles of liquids, gases, or solids intermingle as the result of their spontaneous movement caused by thermal agitation and in dissolved substances move from a region of higher to one of lower concentration.

• Diffusion

• Evaporation

• Liquefaction

• Condensation

Attractive forces that hold atoms together where electrons are shared is known as:

• Ionic bond

• Covalent bond

• Van der Waal’s bond

• Metallic bond

Attractive forces holding atoms together where nuclei and their inner shells of electrons float in a “sea” of free electrons is known as:

• Ionic bond

• Covalent bond

• Van der Waal’s bond

• Metallic bond

A compound that forms when ions in a liquid solution or a gas join together to make a solid that settles out of the solution is known as:

• Precipitate

• Solvent

• Solute

• Isotope

Coal is an example of a mineral.

• True

• False

Crystal faces grow naturally as the mineral forms and reflect atomic structure.

• True

• False

Sugar cubes in crystal form obtained from naturally growing sugarcane are an example of a mineral.

• True

• False