Structure of the Atom

Question 1

Atom

Answer 1

the smallest part of an element

Question 2

sub-atomic particles

Answer 2

particles that atoms are made up of

Question 3

Protons

Answer 3

1 a.m.u
Located in the nucleus
Positive (+1 charge)

Question 4

Electrons

Answer 4

1/1836 a.m.u
Located in the electron cloud surrounding the nucleus
Negative (-1 charge)

Question 5

Neutron

Answer 5

1 a.m.u
Located in the nucleus
Neutral (0 charge)

Question 6

a.m.u

Answer 6

atomic mass unit

Question 7

The atomic number

Answer 7

of an atom is the number of protons in its nucleus

Question 8

How do you find the number of electrons in an atom?

Answer 8

-Because the elements of the periodic table are neutral, the number of protons in the nucleus of an atom and the number of electrons in the electron cloud must be equal to ensure there is no charge.
Therefore the atomic number is equal to the number of protons in an atom.

Question 9

Mass number

Answer 9

of an atom is the combined total of protons and neutrons in its nucleus

Question 10

Isotopes

Answer 10

atoms of the same element that have different numbers of neutrons in the nucleus

Question 11

Ions

Answer 11

atoms that have lost or gained electrons

Question 12

anions

Answer 12

elements which have gained electrons - negative charge

Question 13

cations

Answer 13

elements which have lost electrons -,positive charge

Question 14

Electron cloud is divided…

Answer 14

into energy levels or shells

Question 15

The average mass of the atoms of an element

Answer 15

atomic mass