2.1.1 Atomic Structure & Isotopes

Question 1

How do you determine relative atomic mass?

Answer 1

Aᵣ = (Relative isotopic mass of isotope 1 × Percent abundance of isotope 1)
+ (Relative isotopic mass of isotope 2 × Percent abundance of isotope 2)
÷ 100

Question 2

What is the relative charge of an electron?

Answer 2

1-

Question 3

What is the relative mass of an electron?

Answer 3

¹⁄₁₈₃₆

Question 4

What is an Isotope?

Answer 4

Atoms of the same element with the same number of
protons/electrons but different number of neutrons.

Question 5

What is the definition of Relative Isotopic Mass?

Answer 5

The mass of an isotope relative to 1/12th of the mass of an atom of carbon-12, and it is always a whole number.

Question 6

What is the relative mass of a proton?

Answer 6

1

Question 7

What is the relative mass of a neutron?

Answer 7

1

Question 8

What is the relative charge of a neutron?

Answer 8

0

Question 9

What is the relative charge of a proton?

Answer 9

1+

Question 10

What is a mass spectrometer?

Answer 10

A device used to measure:
- The percentage abundance of each isotope of an element
- The relative isotopic mass of each isotope of an element

Question 12

Describe the physical properties of isotopes.

Answer 12

different isotopes of the same element have a different number of neutrons, therefore, the physical properties are same/different. This will effect the mass, melting and boiling point and density

Question 13

How do you calculate the number of neutrons in an atom?

Answer 13

Mass Number – Atomic Number

Question 14

What is the definition of Relative Atomic Mass?

Answer 14

The weighted mean mass of an atom of an element relative to 1/12th of the mass of an atom of carbon-12.