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Worksheetsprotons, electrons and neutrons
Total questions: 20
Worksheet time: 16mins
Name
Class
Date
1.
A negatively charged atom is one with
a)
equal protons and electrons
b)
more neutrons than protons
c)
more neutrons than protons
d)
more electrons than protons
e)
more protons than electrons
2.
An atom is represented as X2+ . We can infer that in atom X, there are
a)
two more electrons than protons
b)
two more protons than neutrons
c)
two more neutrons than electrons
d)
two more protons than electrons
3.
An atom is represented as mnX
its atomic number is
a)
m
b)
n
c)
n - m
d)
m - n
4.
An atom X has eleven protons and 10 electrons, it can best be represented as
a)
10X+
b)
10X−
c)
11X+
d)
11X−
5.
An atom X has eleven protons and 10 electrons, X is most probably an atom of
a)
Neon
b)
Magnesium
c)
Sodium
d)
Aluminium
6.
An atom of Chlorine with one electron in its outermost shell is best represented as
a)
Cl-
b)
Cl+
c)
Cl 2-
d)
Cl 2+
7.
An atom M has 20 protons, 18 electrons and 20 neutrons. Calculate its mass number
a)
36
b)
40
c)
38
d)
42
8.
A neutral atom of Aluminium [13Al ] has a mass number of 27. Calculate the number of neutrons it contains
a)
11
b)
12
c)
14
d)
34
9.
A neutral atom of Sodium [11Na] has a Relative Atomic Mass of 23. The number of neutrons present in the Sodium atom is
a)
11
b)
23
c)
34
d)
12
10.
An Aluminium atom is represented as 13Al3+. Calculate the number of electrons present in it.
a)
10
b)
13
c)
16
d)
30
11.
An Aluminium atom is represented as 13Al3+. Calculate its mass number if it has 14 neutrons in its nucleus.
a)
13
b)
30
c)
27
d)
24
12.
Calcium is an atom with an atomic number of 20. How many electrons will be present in Ca2+
a)
20
b)
22
c)
18
d)
40
13.
An atom represented as Z2- has 18 electrons and 16 neutrons. The values of its protons and mass numbers are, resepctively
a)
20 and 36
b)
16 and 32
c)
18 and 36
d)
18 and 34
14.
An atom represented as X2+ has 20 protons and a mass number of 40. The values of its electron and neutron numbers are, resepctively
a)
22 and 20
b)
22 and 18
c)
18 and 20
d)
20 and 20
15.
The number of protons, electrons and neutrons in an atom W are, respectively a, b and c. The mass number of W is
a)
a + b
b)
a + b + c
c)
a + c
d)
b + c
16.
How many protons, electrons and neutrons are respectively present in an atom M represented as 1939M+?
a)
19, 18 and 20
b)
20, 19 and 20
c)
18, 19 and 20
d)
20, 19, 19
17.
An atom X has 18 electrons, 17 protons and 18 neutrons. Which of the following statements is/are TRUE about X?
a)
X is an anion
b)
X is a unipositive ion
c)
X has a mass number of 35
d)
X has a mass number of 36
18.
An atom is represented as mnX
its proton number is
a)
m
b)
n
c)
n - m
d)
m - n
19.
A neutral atom is represented as mnX
its electron number is
a)
m
b)
n
c)
n - m
d)
m - n
20.
An atom is represented as mnX
its mass number is
a)
m
b)
n
c)
n - m
d)
m - n
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