6 Three of the halogens in Group VII are listed below.
chlorine
bromine
iodine
(a)
a) How does their colour change down the Group?
.............................................................................................................................. [1]
(ii) How do their melting points and boiling points change down the Group?
.............................................................................................................................. [1]
(iii) Predict the colour and physical state (solid, liquid or gas) of astatine, At.
colour .........................................................................................................................
physical state ....................................................................................................... [2]
53 I,
131
(b) A radioactive isotope of iodine, is used to treat cancer.
(i) Define the term isotope.
....................................................................................................................................
.............................................................................................................................. [2]
53 I?
131
(ii) How many protons, electrons and neutrons are there in one atom of
number of protons ..............
number of electrons ............
number of neutrons ............ [2]
53 I, emits radiation, a different element with a proton number of
(iii) When this isotope, 131
54 is formed.
What is the name of this element?
.............................................................................................................................. [1]
(c) Fluorine, the most reactive halogen, forms compounds with the other halogens. It forms
two compounds with bromine.
Deduce their formulae from the following information.
compound 1
The mass of one mole of this compound is 137 g.
Its formula is ................................. [1]
compound 2
0.02 moles of this compound contain 0.02 moles of bromine atoms and 0.1 moles of
fluorine atoms.
Its formula is ................................. [1]
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[Total: 11]
7 The table gives the composition of three particles.
number of number of number of
particle
protons electrons neutrons
A 15 15 16
B 15 18 16
C 15 15 17
(a) What is the evidence in the table for each of the following?
(i) Particle A is an atom.
....................................................................................................................................
.............................................................................................................................. [1]
(ii) They are all particles of the same element.
....................................................................................................................................
.............................................................................................................................. [1]
(iii) Particle B is a negative ion.
....................................................................................................................................
.............................................................................................................................. [2]
(iv) Particles A and C are isotopes.
....................................................................................................................................
.............................................................................................................................. [2]
(b) (i) What is the electronic structure of particle A?
.............................................................................................................................. [1]
(ii) What is the valency of the element?
.............................................................................................................................. [1]
(iii) Is the element a metal or a non-metal? Give a reason for your choice.
....................................................................................................................................
.............................................................................................................................. [1]
[Total: 9]
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