1.
How many atoms are present in H2O2?
5
4
3
2
2.
Which of the following pairs of elements is in the same period in the periodic table?
5B and 13Al
1H and 3Li
4Be and 5B
11Na and 19K
3.
Which of the following ions is formed by the loss of 2 electrons?
Ca2+
S2-
K+
F-
4.
The element used in the manufacturing of electronic components is
sodium.
fluorine.
silicon.
neon.
5.
The two main particles in the nucleus of an atom are
neutrons and protons.
neutrons and electrons.
shells and neutrons.
electrons and protons.
6.
The periodic table is an arrangement of elements according to increasing
atomic number.
mass number.
nucleon number.
neutron number.
7.
An atom 2311X forms bond by losing one electron, the charge on the ion formed is
-1
-2
+1
+2
8.
The element with the chemical symbol S is ……
silicon
silver
sodium
Sulphur
9.
Which of the following elements has four electron shells?
19K
13Al
15P
5B
10.
The periodic table is an arrangement of elements according to increasing
atomic number.
mass number.
nucleon number.
neutron number.
11.
An atom 2311X forms bond by losing one electron, the charge on the ion formed is
-1
-2
+1
+2
12.
An atom of an element has a neutral charge because the
Protons and electrons are the same particles.
Proton number and electron number are the same.
Neutron number and proton number are equal.
Electron number and neutron number are equal.
13.
An atom has 20 nucleons and 9 protons. What is its neutron number?
9
10
11
12
14.
Which of the following chemical symbols is that of an element with seven electrons in the outermost shell?
20Ca
17Cl
10Ne
16S
15.
When an atom loses an electron, the ion formed is called
an anion.
a cation.
a molecule.
a compound.
16.
The chemical symbol for iron is
I
K
Fe
Au
17.
A substance which cannot be broken down into simpler substances is called
a molecule
a compound
an element
a mixture
18.
The chemical symbol for potassium is
Fe
K
P
Pb
Zn
19.
When a substance is made up of the same kind of atoms it is called
a mixture
a compound
an element
a solution
20.
21.
An element is formed by the combination of
an atom and a compound
a compound and a mixture
an atom and a mixture
a molecule and a compound
22.
In the nucleus of an atom, there are
neutrons and shells
protons and electrons
neutrons and protons
electrons and shells
23.
Which of the following particles can be found in the nucleus of an atom?
Electrons and protons
Electrons and shells
Neutrons and electrons
Neutrons and protons
24.
An atom has 5 protons and 5 neutrons in its nucleus. How many electrons are present in the atom?
1
2
5
9
10
25.
An atoms has 4 protons and 5 neutrons in its nucleus. How many positively charged particles are in the atom?
1
2
3
4
5
26.
The atom of an element has 4 protons and 5 neutrons in its nucleus. How many shells are occupied in the atom?
1
2
3
4
5
27.
Which of the following substances is made up of only one kind of atom?
Iron
Salt
Steel
Water
28.
The above diagram illustrates the structure of an atom. The components labeled X and Y are respectively
neutrons and shells.
ions and neutrons.
neutrons and nucleus.
nucleus and neutrons
29.
Atoms of the same element have the same
I. number of electrons
II. number of protons
III. chemical properties
Which of the above statements are true?
I and II only
II and III only
I and II only
I, II and III
30.
Which of the following elements is a liquid at room temperature.
Carbon.
Mercury.
Silver.
Sulphur.
31.
The chemical symbol of potassium is
Na.
K.
Pb.
S.
32.
The atom of an electron is represented as 1735 Cl. How many electrons are in the atom?
52
35
18
17
33.
An atom which contains more electrons than protons becomes a
positive ion.
negative ion.
neutral atom.
binary compound.
34.
The chemical symbol of potassium is
K.
N.
P.
S.
35.
A substance which is made up of the same kind of atoms is called
a compound.
a mixture.
an element.
an ion.
36.
An atom of carbon is represented as 612 C. How many neutrons are in the nucleus of the carbon atom?
2
4
6
12
37.
An example of a noble gas is
chlorine
neon.
nitrogen.
oxygen.
38.
An atom has 6 protons and 7 neutrons in its nucleus. What is the mass number?
1
6
7
13
39.
An atom of an element is represented as 1225 X. What is the respective number of neutrons and protons in the atom?
12 and 13
12 and 25
13 and 12
25 and 12
40.
The sub-atomic particle with zero charge in the nucleus of an atoms is called
electron.
ion.
neutron.
proton.
41.
A positively charged ion is called
anion.
cation.
neutron.
proton.
42.
An atom of an element is represented as 1327 X. How many neutrons are in the nucleus of the atom?
13
14
27
40
43.
The element with the chemical symbol S is
silicon
silver
sodium
Sulphur
44.
Elements that could easily lose electrons to form cations are
metals.
non-metals.
semi-metals.
noble gases.
45.
An atom has a proton number of 17 and neutron number 18. Determine the number of electrons in the third shell of the atom.
1
3
5
7
46.
What is the chemical symbol for silver?
Ag
Au
Si
S
47.
A substance which is made up of the same kind of atoms is called
a compound
an element
a mixture
an ion
48.
The elements in the periodic table are arranged according to their
atomic number
atomic mass
mass number
neutron number
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