Lesson 2

Question 1

proton

Answer 1

One of the principal particles of an atom. The proton has a positive electric charge and is found in the nucleus of an atom. A proton weighs on atomic mass unit, which is about 1.66 x 10 to the power of -27 kg.

Question 2

neutrons

Answer 2

One of the principal particles in an atom. The neutron has no electric charge and is found in the nucleus of an atom. The mass of a neutron is about one atomic mass unit or 1.67492711 x 10 to the power of -27 kg.

Question 3

nucleus

Answer 3

The central core of an atom. The nucleus is made of protons and neutrons. The electrons circle around the nucleus.

Question 4

electron

Answer 4

The smallest significant particle in an atom. Electrons have a negative electric charge and orbit around the nucleus.

Question 5

ion

Answer 5

A variation of an atom or atoms based on the loss or gain of an electron. This changes the charge of the atom.

Question 6

cations

Answer 6

An atom that has lost an electron. Cations have more protons than electrons, giving them a positive charge.

Question 7

anions

Answer 7

An atom that has gained an electron. Anions have more electrons than protons, giving them a negative change.