Atoms

Question 0

Electrons:

Answer 0

Move around the nucleus

Negative charge

Tiny compared to the nucleus

Virtually no mass

Occupy shells around the nucleus

Question 1

The nucleus

Answer 1

Middle of the atom

Contains protons and neutrons

Overall positive charge

Almost the whole mass of an atom is concentrated in the nucleus

Tiny compared to the atom

Question 2

Neutrons:

Answer 2

Heavy

Neutral (no charge)

Found in the nucleus of an atom

Question 3

Protons:

Answer 3

Heavy

Positively charged

Found in the nucleus of an atom

Question 4

Protons = Electrons

Answer 4

Neutral atoms have no charge overall

Charge on the electrons same size as the charge on the protons

Number of protons always equals number of electrons in an atom

Question 5

Electron Shell Rules:

Answer 5

Electrons always occupy shells

Lowest energy levels are always filled first

Electron configuration - 2,8,8,2

Atoms much happier when they have full electron shells

In most atoms outer shell is not full which makes atom want to react

Question 6

Atomic number:

Answer 6

How many protons there are in an atom

Unique to that element

Tells you how many electrons there are

Bottom number

Question 7

Mass number:

Answer 7

Total number of protons and neutrons in the atom

Top number