Page 15 - ACE YR IGCSE A TOP APPROACH TO CHEM

Based on the electronic structure, the atom 9 The diagrams show the structures of some
should be located at substances.

A B C
D

R S
+ + + + +
7 An element has the electronic configuration + + + + + +
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of 2,8,8,2. + + + + +
Which statement is correct about the T U
element? Which statement is true?
A It is a Group II element. A R and U are covalent compounds.
B It is located in Period 2 of the Periodic B S and T are ionic compounds.
Table. C S has the highest melting point.
C It is a noble gas. D R can conduct electricity.
D It is a non-metal.

Clone Oct / Nov 2015
8 The diagrams show the structures of X, Y
and Z. 10 Ammonia, NH is a covalent compound.
3
Elements share electrons to form bonds.
Which one shows the correct structure?
A –
3+
–
X Y
–

B

Z
C –
Which one is true about X, Y and Z?
3–
X Y Z –
A element mixture compound –

B element compound mixture
C mixture compound element D

compound mixture element

Cambridge IGCSE TM
12 Ace Your Chemistry

Chapter 2.indd 12 3/4/22 11:59 AM