(Answered) 1 bromine has two natural isotopes br-81 495 and br-79 505a

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1. Bromine has two natural isotopes, BR-81 (49.5%) and Br-79 (50.5%)

a) What are the atomic numbers and neutron numbers of these isotopes?

b) Use this information to explain why the atomic weight of chlorine is 79.9

2. Br-80 decays by beta emission with a half-life of 17.6 minutes

a) Write down the decay equation showing the daughter nucleus and radiation products of this emission.

b) The daughter nucleus of Br-80 decay then decays by emitting a gamma ray. What further change will there be in this nucleus

3. a) What are the energies of the n=3 and n=1 energy levels of the hydrogen atom?

b) What is the energy of the radiation given off by a hydrogen atom when it changes from the n=3 to the n=1 state?

c) What is the wavelength of this radiation?

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