Structure 1.2

Question 1

Atoms are almost entirely….

Answer 1

empty space

Question 2

Nucleons

Answer 2

Protons and neutrons, they make up the nucleus

Question 3

Protons

Answer 3

Charge of +1

Question 4

Neutrons

Answer 4

Neutral charge

Question 5

Electrons

Answer 5

Charge of -1

Question 6

Formula for atomic mass

Answer 6

Atomic Mass= moles x (proton mass + electron mass), masses in kg

Question 7

What does the difference in mass mean for the properties of isotopes?

Answer 7

Their physical properties such as melting and boiling points will differ

Question 8

Nulcelon

Answer 8

The number of protons and neutrons of an atom

Question 9

Isotope

Answer 9

Atoms with the same number of protons (atomic number) but different numbers of neutrons

Question 10

Radioisotope

Answer 10

The unstable form of an element that emits radiation to transform into a more stable form.

Question 11

Atomic Number (Z)

Answer 11

The number of protons in the nucleus of an atom

Question 12

Mass number (A)

Answer 12

The number of protons and neutrons in the nucleus of an atom

Question 13

Relative atomic mass (Ar)

Answer 13

The weighted mean of the naturally occurring isotopes of an element, relative to 1/12 of a carbon atom.

Question 14

What are mass spectrometers used for?

Answer 14

To find the relative amounts of naturally occurring isotopes in a sample of an element.

Question 15

In shorthand notation for an atom/ion where is the atomic number

Answer 15

At the bottom

Question 16

In shorthand notation for an atom/ion where is the mass number

Answer 16

At the top

Question 17

Physical properties of isotopes

Answer 17

Different isotopes have different physical properties such as melting and boiling points due to the different numbers of neutrons.