WorksheetsENIOLA’S AUGUST CHEMISTRY ASSESSMENT
Total questions: 30
Worksheet time: 18mins
The relative charge of a proton is:
–1
0
+1
+2
Which subatomic particles are found in the nucleus of an atom?
Protons and neutrons
Neutrons and electrons
Protons and electrons
Only protons
The atomic number of sodium is 11. This means sodium has:
11 neutrons
11 protons
11 electrons in its outer shell
22 protons
Isotopes of the same element have:
The same number of protons but different number of neutrons
The same number of neutrons but different number of protons
Different numbers of protons and electrons
Different atomic numbers
An atom of magnesium has 12 protons, 12 neutrons and 12 electrons. Its mass number is:
12
24
36
144
Which element is in Group 1 of the periodic table?
Calcium
Potassium
Magnesium
Aluminum
Elements in the same group of the periodic table have:
The same number of protons
The same number of neutrons
The same number of electrons in the outer shell
The same mass number
Which noble gas has 2 electrons in its outer shell?
Neon
Helium
Argon
Krypton
The relative mass of an electron is approximately:
1
0
1/2000
2000
Which particle has no charge?
Proton
Neutron
Electron
Positron
An atom has 17 protons and 18 neutrons. What is its mass number?
17
18
35
36
The maximum number of electrons the second shell of an atom can hold is:
2
4
6
8
Which of these is a property of group 1 metals?
They are very hard and dense
They react rigorously with water
They form covalent bond with halogens
They have high melting points
Which statement about noble gases is correct?
They are very active because of their full outer shells
They are unreactive because of their full outer shells
They are solid at room temperature
They form compounds easily with group 1 metals
What is an ion?
A neutral atom with equal protons and electrons
An atom that has lost and gained protons
An atom that has lost and gained electrons
A particle that has same number of neutrons and electrons
A positively charged ion is known as
Cathode
Anode
Cation
Anion
The S block on the periodic table comprises of
Metals
Metalloids
Non - metals
Transition metals
Element number 20 is
Potassium
Sodium
Calcium
Sulphur
The following are stable elements except
Neon
Helium
Baron
Argon
The centre of an atom is
Neutron
Proton
Electron
Nucleus
Chlorine forms a chloride ion by:
Losing 1 electron
Gaining 1 electron
Losing 2 electrons
Gaining 2 electrons
When a sodium atom forms an ion, it:
Gains one electron to form Na-
Loses one electron to form Na+
Gains two electrons to form Na2-
Loses two electrons to form Na2+
Which of these correctly shows the ionic equation for the reaction of H⁺ with OH⁻?
H+ + OH- _ H2O
H + O — HO
H2 + O2 — H2O
H+ + O2- — H2O
Which of these is the same in isotopes of an element
Mass number
Atomic number
Number of neutrons
Relative atomic mass
The smallest particle of an element which can take part in a chemical reaction is :
Element
Metal
Compound
Atom
—-is also known as proton number
(a)
Elements having same proton number but different mass number is known as:
(a)
The mass number is the sum of __________ and __________.
(a)
The maximum number of electrons that can occupy the first shell is (a) .
The rows of the periodic table are called (a) .
