This question is about bromine and some of its compounds.
Atoms of bromine can be represented as 79Br^{79}\text{Br}79Br and 81Br^{81}\text{Br}81Br.
State the number of protons, neutrons and electrons in an atom of 81Br^{81}\text{Br}81Br.
What name is used for atoms of bromine that have different numbers of neutrons?
Why do all atoms of bromine have the same chemical properties?
The relative atomic mass of bromine is given in the Periodic Table as 79.979.979.9. Suggest, with a reason, which of the atoms 79Br^{79}\text{Br}79Br and 81Br^{81}\text{Br}81Br exists in greater numbers in a sample of bromine.
Hydrogen bromide (HBr\text{HBr}HBr) and sodium bromide (NaBr\text{NaBr}NaBr) are compounds of bromine.
Describe the distribution of outer-shell electrons in a hydrogen bromide molecule by stating the number of shared electron pairs in the bond and the number of unshared outer-shell electrons remaining on the bromine atom.
Explain how the atoms are held together in a hydrogen bromide molecule.
Explain why sodium bromide has a higher melting point than hydrogen bromide.
A compound has the percentage composition 15.2%15.2\%15.2% sodium, 53.0%53.0\%53.0% bromine and 31.8%31.8\%31.8% oxygen by mass. Calculate its empirical formula. [Relative atomic masses: Na=23\text{Na} = 23Na=23, Br=79.9\text{Br} = 79.9Br=79.9, O=16\text{O} = 16O=16]
