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WorksheetsG-9 CHEMISTRY (VALENCY 24-6-21)
Total questions: 10
Worksheet time: 5mins
Name
Class
Date
1.
Which of the following has valency 3?
a)
nitrate
b)
sulphate
c)
phosphate
d)
thiosulphate
2.
An element has 5 valence electron , what is its valency?
a)
4
b)
3
c)
2
d)
1
3.
An atom has four shells and 19 protons in its atom , what is its valency?
a)
1
b)
2
c)
3
d)
4
4.
what is valency of the given element?
a)
1
b)
2
c)
3
d)
4
5.
The electronic configuration of Neon is
a)
2,8
b)
2,7
c)
2,8,8
d)
2,6
6.
What's the chemical name of Natrium?
a)
Silicon
b)
Sodium
c)
Potassium
d)
Magnesium
7.
The electronic configuration of Potassium is
a)
2,8,8,1
b)
2,8,7
c)
2,8,8
d)
2,8,1
8.
If the atomic number of an element is 12 and its mass number is 24, how many neutrons are contained in the nucleus?
a)
6
b)
12
c)
24
d)
8
9.
Which of the following does not have 8 valence electrons?
a)
Ar
b)
Ne
c)
Xe
d)
He
10.
An atom that loses or gains electrons is called a(n)
a)
isotope.
b)
proton.
c)
neutron.
d)
ion.
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