EL 1

Question 1

What are the relative masses of both protons, and neutrons?

Answer 1

1

Question 2

What are the relative masses of electrons?

Answer 2

1/2000

Question 3

Mass number=

Answer 3

Protons + neutrons

Question 4

Atomic number =

Answer 4

Protons

Question 5

What are isotopes?

Answer 5

Atoms of the same element with different mass numbers but the same atomic number

Question 6

What are the characteristics of a lightweight star?

Answer 6

• Smaller mass
• Lower temp/ less pressure at core
• Longer lifespan
• Can only do nuclear fusion with H & He

Question 7

What was the plum pudding model?

Answer 7

• A positively charged sphere
• with negatively charged electrons embedded in

Question 8

What does Ar mean?

Answer 8

Relative atomic mass (average mass of an atom of an element)

Question 9

What is Mr?

Answer 9

Relative molecular mass - average mass of a molecule
Eg. Mr(H2O) = (1x2) + 16

Question 10

How can relative mass be measured?

Answer 10

Using a spectrometer

Question 11

How do you calculate Ar from a mass spectrum that only gives relative abundance?

Answer 11

For each reading do:
% isotopic abundance = (relative abundance / total relative abundance) x 100

And then continue normally

Question 12

What is nuclear fusion?

Answer 12

The joining of two smaller nuclei to create one larger nucleus

Question 13

What conditions are needed for nuclear fusion?

Answer 13

High temp and high pressure to overcome the nuclear repulsion