Atomic structure (S1)

Question 1

What are the 5 methods of separating mixtures?

Answer 1

• solvation
• filtration
• crystallization
• chromatography
• distillation

Question 2

What does A represent?

Answer 2

mass number

Question 3

What is mass number?

Answer 3

protons + neutrons

Question 4

What does Z represent?

Answer 4

atomic number

Question 5

What is atomic number?

Answer 5

number of protons (so also electrons)

Question 6

How does atomic notation look like?

Answer 6

A on the top, Z on the bottom

Question 7

What’s the difference between isotopes?

Answer 7

number of neutrons, therefore atomic mass

Question 8

How to calculate the relative atomic mass of an element when dealing with isotopes?

Answer 8

sum of (percentage in fraction x atomic mass)

Question 9

What happens to electrons in the emission spectrum?

Answer 9

they emit energy, as they return to lower energy levels

Question 10

What happens to electrons in the absorption spectrum?

Answer 10

they absorb energy, as they jump yo higher energy levels

Question 11

List 3 assumptions of Bohr’s model

Answer 11

• electrons exist at specific energy levels
• orbits get closer at higher energies
• colours are produced/absorbed during electron transitions

Question 12

What causes red line in hydrogen emission spectra?

Answer 12

photon when electrons drops from 3 to 2 energy level

Question 13

What’s the general trend for ionisation energy?

Answer 13

as more electrons are removed, the ionisation energy is getting higher for next electrons