Standard Grade Chemistry
Problem Solving
Focusing on Atoms and Ions
You may wish to use the data booklet to help you with these questions.
1.
Many chemical compounds contain ions.
A
BaO
D
KCl
(a)
(b)
2.
C
CuO
F
Sr Cl2
Identify the compound which gives a lilac flame colour.
Identify the compound in which both ions have the same electron arrangement.
Nuclide notation is used to identify atoms and ions.
(a)
(b)
3.
B
CaBr2
E
NaBr
Identify the two particles which have the same electron arrangement.
Identify the two particles which have the same number of protons and also the
same number of electrons.
Alums are a group of ionic compounds. Some of them are shown in the table.
Common name
ammonium alum
chrome alum
potash alum
ferric alum
(a)
(b)
Chemical name
aluminium ammonium sulphate
chromium(III)potassium sulphate
ammonium iron(III)sulphate
Give the chemical name for potash alum.
Give the formula for ferric alum.
Formula
NH4Al(SO4)2
KCr(SO4)2
KAl(SO4)2
4.
Atoms can form ions with either a positive or negative charge.
A
D
(a)
(b)
5.
Li
-
Cl
B
E
C
+
K
Br
-
F
Mg2+
O2-
Identify the two ions with the same electron arrangement as an argon atom.
Identify the ion which has a red flame colour.
Different numbers are used to give information about atoms.
A
B
C
D
(a)
(b)
6.
+
Atomic number
Mass number
Number of outer electrons
Number of electron energy levels
Identify the number which is the same for sodium and chlorine atoms.
Identify the number which is 7 for fluorine.
Nuclide notation allows the numbers of electrons, protons and neutrons in atoms and
ions to be calculated.
(a)
(b)
(c)
(d)
Identify the
Identify the
Identify the
Identify the
two atoms which are isotopes.
two particles with the same electron arrangements as argon
particle with 18 neutrons.
two particles with 18 electrons.