3.2 Word Definitions

Question 1

Atom

Answer 1

An atom is the smallest unit of ordinary matter that forms a chemical element

Question 2

Ion

Answer 2

A charged atom or molecule

Question 3

Neutron

Answer 3

A particle found in the nucleus of an atom. It is almost identical in mass to a proton, but carries no electric charge

Question 4

Proton

Answer 4

Particle found in a nucleus with a positive charge. Number of these gives atomic number

Question 5

Electron

Answer 5

A stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.

Question 6

Molecule

Answer 6

a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.

Question 7

Neutral particle

Answer 7

a neutral particle is a particle with no electric charge, such as a neutron

Question 8

Compound

Answer 8

A compound is a substance formed when two or more chemical elements are chemically bonded together

Question 9

Elements

Answer 9

An element is a substance whose atoms all have the same number of protons: another way of saying this is that all of a particular element’s atoms have the same atomic number.

Question 10

Chemical reaction

Answer 10

Chemical reactions occur when chemical bonds between atoms are formed or broken.

Question 11

Chemical bond

Answer 11

a connection between two surfaces or objects that have been joined together, especially by means of an adhesive substance, heat, or pressure.

Question 12

Carbon

Answer 12

a nonmetallic chemical element with atomic number 6 that readily forms compounds with many other elements and is a constituent of organic compounds in all known living tissues

Question 13

Oxygen

Answer 13

The chemical element oxygen is classed as a chalcogen gas and a nonmetal.

Question 14

Hydrogen

Answer 14

The chemical element hydrogen is classed as a nonmetal. It can become metallic at very high pressures.