spectra

Question 1

Describe the Bohr model of the atom

Answer 1

• nucleus contains protons and neutrons
• positively charged
• electrons orbiting the nucleus

Question 2

What is an atoms ground state?

Answer 2

its lowest energy level

Question 3

What are energy levels?

Answer 3

places in which electrons will orbit the nucleus, at only exact values of energy

Question 4

What happens when an electron absorbs or drops energy?

Answer 4

absorbs- move to higher energy level

drops-move to a lower energy level

Question 5

What is the ionisation level?

Answer 5

the electron has zero potential energy so escapes the electrostatic attraction to the nucleus and will be ionised

Question 6

When is an absorption spectrum produced?

Answer 6

when an electron moves from a lower energy level to a higher one

Question 7

What are the equations involving energy levels?

Answer 7

E1-E2=hf

E=hf

Question 8

When is an emission spectrum produced?

Answer 8

when electrons move from a higher energy level to a lower one

Question 9

What are absorption lines in the spectrum of sunlight evidence for?

Answer 9

the composition of the suns outer atmosphere