Energy Levels — Practice Quiz

Question 1

Energy required to ionise hydrogen from its first excited state (n = 2) is:

Accepted Answer

3.4 eV

Answer

13.6 eV

Answer

6.8 eV

Answer

1.51 eV

Question 2

Energy of the n=4 level of singly-ionised helium He⁺:

Accepted Answer

−3.4 eV

Answer

−13.6 eV

Answer

−0.85 eV

Answer

−0.21 eV

Question 3

Transition from n=3 to n=2 in hydrogen emits a photon of energy:

Accepted Answer

1.89 eV

Answer

10.2 eV

Answer

12.1 eV

Answer

13.6 eV

Question 4

How many possible emission lines arise from a hydrogen atom in the n=4 state?

Accepted Answer

6

Answer

3

Answer

4

Answer

10

Question 5

Excited state of an atom is one in which:

Accepted Answer

An electron has been promoted to a higher energy level

Answer

Electrons move faster

Answer

Atom has more electrons

Answer

Atom is ionised