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WorksheetsSTRUCTURE OF THE ATOM
Total questions: 20
Worksheet time: 20mins
Chemistry is the study of
The use of chemicals
Chemical processes in living things
Matter and how they interact with each other
Natural matter in the Earth's crust
Which of the following substances is made up of atoms?
Iron
Nitrogen
Water
Sodium chloride
Atoms X forms a positive ion. Which of the following is atom X?
Bromine
Chlorine
Hydrogen
Oxygen
Which of the following statements is true about the kinetic theory of matter?
The particles in liquids are packed closely together in an orderly manner
The particles in solids move randomly
The forces between the particles of gases are stronger than those of liquids.
The energy content of a gas is higher than that of a solid.
This process shows the change of the state of matter.
Which of the following is the process?
Melting
Freezing
Boiling
Condensation
A liquid was heated until it became gas completely.
The gas was then cooled until it completely changed to the solid state.
Diagram below shows the graph of temperature against time for the experiment.
Among A, B, C and D, at which section on the graph does freezing occur?
A
B
C
D
This table shows the melting and boiling points of four pure substances.
Which of the following substances has the lowest energy content at room temperature?
P
Q
R
S
This diagram shows the cooling curve for liquid X.
Which of the following statements are true about substance X?
The freezing point of substance X is T celcius.
At time t1, both liquid and solid are present.
At time t2, the particles of X absorb heat energy.
At T celcius, the forces between the particles of X are overcome.
Which of the following scientists discovered the electron?
J. J. Thomson
Ernest Rutherford
Niels Bohr
James Chadwick
This diagram shows an atomic model.
Which of the following statements is true about the atomic model?
It was built based on the existance of neutrons.
It was proposed by James Chadwick.
It shows that the nucleus is neutral.
It shows that electrons move in the shells arount the nucleus.
Atom X has a proton number of 5 and a nucleon number of 11.
How many protons, electrons and neutrons are present in atom X?
Protons:5
Electrons:5
Neutrons:11
Protons:5
Electrons:5
Neutrons:6
Protons:5
Electrons:6
Neutrons:6
Protons:6
Electrons:6
Neutrons:5
The nucleus of an atom contains
Electrons only
Neutrons only
Both protons and neutrons
Both protons and electrons
An atom of chlorine-37 has 17 electrons.
How many neutrons does an atom of chlorine-37 contain?
17
20
37
54
This table shows the proton numbers, nucleon numbers and numbers of electrons of four particles.
Which of the following pairs of particles are isotopes of the same element?
G and L
J and L
L and M
J and M
Radiation emitted by a certain radioisotope is used to kill bacteria and other microorganisms in foods such as potatoes. What is the isotope?
Carbon-14
Cobalt-60
Iodine-131
Phosphorus-32
A patient is diagnosed of having cancer.
Which isotope is used to treat the patient?
Carbon-14
Sodoum-24
Phosphorus-32
Cobalt-60
Which of the following are the differences of isotopes of elements?
Number of protons
Number of neutons
Physical properties
Chemical properties
An atom of element Y has 18 protons and 22 neutrons in its nucleus.
What is the number of valence electrons in atom Y?
2
4
5
8
An atom of element X has a nucleon number of 14. The electron arrangement of this atom is 2.4.
Which of the following statements is true about an atom of element X that has a nucleon number of 13?
The atoms has 7 protons
The electron arrangement of the atom is 2.4
The atom has 8 neutrons
The atoms has 3 valence electrons
Which of the following represents the electron configuration of a metallic element?
2.5
2.8
2.8.3
2.8.7
