Atoms

Question 1

Atoms

Answer 1

The smallest unit of an element that maintains the properties of that element.

Question 2

Electron

Answer 2

A subatomic particle that has a negative charge.

Question 3

Nucleus

Answer 3

In physical science an atom’s central region which is made up of protons and neutrons.

Question 4

Electron cloud

Answer 4

A region around the nucleus of an atom where electrons are likely to be found.

Question 5

Proton

Answer 5

A subatomic particle that has a positive charge and that is found in the nucleus of an atom.

Question 6

Atomic mass unit

Answer 6

A unit of mass that describes the mass of an atom or molecule.

Question 7

Neutron

Answer 7

A subatomic particle that has no charge and that is found in the nucleus of an atom.

Question 8

Atomic number

Answer 8

The number of protons in the nucleus of an atom; this is the same for all atoms of an element.

Question 9

Isotope

Answer 9

An atom that has the same number (or protons the same atomic number) as other atoms of the same element do but that has different number of neutrons (and thus a different atomic mass number)

Question 10

Mass number

Answer 10

The sum of the numbers of protons and neutrons in the nucleus of an atom.

Question 11

Atomic mass

Answer 11

The mass of an atom expressed in amu’s (atomic mass units)