WorksheetsChemical bond & Valency
Total questions: 20
Worksheet time: 10mins
How many electrons are there in the valence shell of the O2– ion?
2
8
10
6
An atom that loses or gains electrons is called a(n)
isotope.
proton.
neutron.
ion.
What is the formula of the compound formed between magnesium and oxygen?
MgO
Mg2O2
MgO2
Mg2O
Which one of the following elements has valence electrons in the n = 3 shell?
Beryllium
Silicon
Hydrogen
Neon
Which of the following correctly represents the electronic distribution in the Mg atom? .
3, 8, 1
2, 8, 2
1, 8, 3
8, 2, 2
An element has 3 valence electrons in its outermost 3rd shell. The name of the element is ____________.
B
Al
Ga
In
A symbol represents ____________
one molecule of an element.
one ion of an element.
one atom of an element.
atomic number of an element.
A molecule of a compound is electrically _______________.
positive
negative
either a) or b)
neutral
The molecular formula of the compound aluminium sulphate is
Al(SO4)3
Al2S3
Al2(SO3)3
Al2(SO4)3
An example of an element which shows variable valency and an element which does not is
Cu and Fe
Cu and Sn
Fe and Al
Fe and Pb
The electronic configuration of chlorine is
2,7
2,8,8,7
2,8,7
2,7,8
When an element exists as a molecule, each unit consists of two or more ____________.
ions
radicals
atoms
valency
The symbol of ammonium radical is ______.
CO32-
SO42-
NH4+
NO3-
Which of the following is the symbol of the element silver?
Au
Al
Ag
Hg
Nitrogen (N2) is an example of __________.
monoatomic molecules
diatomic molecules
triatomic molecules
polyatomic molecules
The correct chemical name of Na2O is
sodium hydrogen carbonate.
sodium oxide.
sodium sulphide.
sodium hydroxide.
What are the constituent elements of ammonium chloride?
Nitrogen
Hydrogen
Chlorine
All of the above
The correct symbol for copper is ______.
C
Cl
Cr
Cu
Which of the following is an electropositive trivalent ion?
Magnesium
Chromium
Nickel
Cobalt
The valency of nitrogen is ____________.
3
2
4
1
