Atomic Structure And Isotopes

Question 1

Nucleus

Answer 1

Positively charged - because of protons

• almost whole mass of an atom is concentrated in the nucleus

Question 2

Electron

Answer 2

Negatively charged
Move around nucleus in shells

• their size of orbit determines the size of the atom

Question 3

Particle. Relative mass. Relative charge

Proton. 1 +1
Neutron. 1 0
Electron. 1/2000 -1

Answer 3

..

Question 4

The charge of an electron is what?

Answer 4

The same as a proton but opposite

Question 5

Number of … and … is the same

Answer 5

Protons and electrons

Question 6

Mass number

Answer 6

Top number

Protons + electrons

Question 7

Atomic number

Answer 7

Bottom number

Protons

Question 8

Isotope

Answer 8

Atoms of the same element,
With the same number of protons,
Different number of neutrons

Question 9

Relative atomic mass

Answer 9

Average mass of an atom compared to carbon-12 on a scale where carbon-12 is 12

Question 10

Working out relative atomic mass

Answer 10

1: Multiply mass of each isotope by the relative abundance
2: Add them together
3: Divide both by sum of relative abundance