Atomic Structure

Question 1

Proton/atomic number of an atom

Answer 1

Number of protons in nucleus of atom

Question 2

Mass/nucleon number of an atom

Answer 2

Number of protons + neutrons in nucleus of atom

Question 3

What does Ar stand for?

Answer 3

Relative atomic mass

Question 4

Definition of relative atomic mass

Answer 4

Average mass of an atom of an element, taking account of its isotopes, relative to 1/12th the relative mass of an atom of carbon-12

Question 5

What does Mr stand for?

Answer 5

Relative molecular mass

Question 6

Definition of relative molecular mass

Answer 6

Average mass of molecule, compared to 1/12th relative atomic mass of an atom of carbon-12

Question 7

What are isotopes?

Answer 7

Atoms of same element with same number protons but different number neutrons

Question 8

Symbol for proton/atomic number

Answer 8

Z

Question 9

Symbol of mass/nucleon number

Answer 9

A

Question 10

What’s the relative mass of a electron?

Answer 10

1/2000

Question 11

How do you work out the number of neutrons?

Answer 11

Mass number - atomic number

Question 12

Is mass number the top or bottom number?

Answer 12

Top

Question 13

Is atomic(proton) number the top or bottom number?

Answer 13

Bottom