2.1 Spectra, Quanta, Ionisation

Question 1

Atomic Spectra is caused by?

Answer 1

Electrons moving between different energy levels.

Question 2

What about the electrons in atomic spectra?

Answer 2

They are fixed for any one atom

Question 3

What does Quantum theory state?

Answer 3

Matter can only emit or absorb energy in small fixed amounts

Question 4

What happens to an electron in an atom?

Answer 4

When it absorbs a photon of energy, it moves from a lower energy level to a higher energy level

Question 5

What does the frequency of the line in the emission spectrum represent?

Answer 5

The difference in energy between the energy levels

Question 6

What do we call those energy levels?

Answer 6

shells or sub-shells

Question 7

What does the letter n define?

Answer 7

the principal quantum number

Question 8

What is n=1?

Answer 8

the lowest energy

Question 9

What would occupy level n=1?

Answer 9

a hydrogen atom in the ground state under normal conditions

Question 10

What does an electron escaping n=1 to infinity correspond to?

Answer 10

• the electron breaking away from the atom completely

- represents the ionisation energy of that element

Question 11

How can ionisation energy be represented generally?

Answer 11

X(g) —> X+ (g) + e-