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716
Which of the these metals will not liberate hydrogen from dilute HCI?
A.
Copper
B.
Iron
C.
Magnesium
D.
Zinc
View Answer & Discuss (1)
WAEC 2007
717
The mass spectrometer can be used to measure mass of
A.
an atom
B.
an electron
C.
a proton
D.
a neutron
View Answer & Discuss (3)
WAEC 2008
718
Find the number of neutrons in an atom represented by 45
21
X.
A.
21
B.
24
C.
45
D.
66
View Answer & Discuss (1)
WAEC 2008
719
The valence electrons in a chloride ion are [
17
CI]
A.
2p electrons only
B.
3s and 3p electrons only
C.
3p and 3d electrons only
D.
3p electrons only
View Answer & Discuss (4)
WAEC 2008
720
What is the atomic number of an element whose cation Y
+
has the electronic configuration 1s
2
2s
2
2p
6
?
A.
9
B.
10
C.
11
D.
12
View Answer & Discuss (16)
WAEC 2008
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