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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?
Hydrogen bromide (HBr) and sodium bromide (NaBr) are compounds of bromine.
Draw a dot and cross diagram to represent a hydrogen bromide molecule. Show only the outer electrons in each atom.
Explain how the atoms are held together in a hydrogen bromide molecule. (2)
Explain why sodium bromide has a higher melting point than hydrogen bromide. (3)
Acompoundhasthepercentagecomposition13.8%sodium,47.9%bromineand 38.3% oxygen by mass.
Calculate its empirical formula.
Empirical formula = ................ (3)
is a metal
A - B - C - D (1)
could be diamond
A - B - C - D (1)
is a gas at 20*C
A - B - C - D (1)
contains oppositely charged ions
A - B - C - D (1)
Some of the substances in the table are compounds. What is meant by the term compound? (2)
The electronic configurations of atoms of sodium and chlorine are
Na 2.8.1
Cl 2.8.7
Describe the changes in the electronic configurations of sodium and chlorine when these atoms form sodium chloride (3)
Calculate the relative formula mass of sodium chloride (NaCl). Use the Periodic use table to help you.
relative formula mass = ..............(2)
Use the the Periodic Table on page 2 to answer this question.
The symbol for silver is
Ag - As - S - Si
The element with an atomic number of 40 is
AI - Ar - Ca - Zr
An atom of an element has the electronic configuration 2.8.3
State the number of the group in the Periodic Table in which this element is found.
An atom of an element has the electronic configuration 2.8.3
Explain your answer in terms of the atom’s electronic configuration.
An atom of an element has the electronic configuration 2.8.3
State the number of the period in the Periodic Table in which this element is found.
An atom of an element has the electronic configuration 2.8.3
Explain your answer in terms of the atom’s electronic configuration.
An atom of an element has the electronic configuration 2.8.3
Identify the element.
Bromine is an element in Group 7 of the Periodic Table. (a) What is the name given to the Group 7 elements?
alkali metals - alkaline earth metals - halogens - noble gases
Small pieces of lithium and potassium are added to separate large troughs of water.
State one observation that would be similar for each element, and one that would be different for each element. (2)
similar.................
different......................
Suggest the formula of the compound formed when potassium reacts with oxygen, and when potassium reacts with chlorine.
oxygen ........
chlorine .......
relative atomic mass = ............ (2)
