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WorksheetsGrade 10 Chemistry Test
Total questions: 30
Worksheet time: 8hrs 30mins
The number of protons in the nucleus of an atom is known as the ______ of that element.
mass number
atomic number
electron count
nucleus
Select one of these statements on Chlorine that is incorrect:
The mass number for Chlorine is 35
The atom number for Chlorine is 17
A Cl- ion would have 18 electrons
1735Cl has 17 neutrons within its nucleus
The chemical properties of an element are determined by its _____.
atomic number
mass number
number of neutrons
number of electrons
How do negative ions form?
An element losing an electron
An element gaining an electron
An element losing a neutron
An element losing a proton
Which one of the following statements on isotopes is correct?
Isotopes are atoms of the same element, but with different atomic numbers
Isotopes are atoms of different elements, but with the same mass number
Isotopes are atoms of the same element with the same atomic number, but different mass numbers
Isotopes of the same element have different chemical properties
What is the name of atom number 2?
Neon
Argon
Chlorine
Sodium
This image represents isotopes of a certain element. Can you name the element?
Nitrogen
Oxygen
Carbon
Fluorine
This is an element with 13 neutrons in its nucleus. Name the element, if A = 24?
Mg
Na
Cr
Al
Which of the following is the correct order for electrons filling in orbitals?
4s, 3d, 4p, 4d
2p, 3s, 3p, 3d
3s, 3p, 4s, 3d
1s, 2s, 2p, 2d
How many electrons are there in the “p’ orbitals of the last shell (principal energy level) of potassium, atomic number 19?
0
2
3
1
The number of electrons in the highest energy level of 20Ca is ____.
6
2
8
5
The characteristic light spectrum of an element is produced when _____.
electrons drop back to lower energy levels
the energy level of the nucleus is increased
electrons are raised to higher energy levels
electrons are emitted by an atom
The relationship between the energy of an electron and the electron’s distance from the nucleus is basically ____.
the greater the energy the farther the electron is from the nucleus
electrons of all energies remain the same distance away from the nucleus
the distance of the electron from the nucleus is unrelated to the electron’s energy
the greater the energy the closer the electron is to the nucleus
The total number of electrons that can fill the "p" sublevel is ____.
10
8
3
6
How many more electrons are there in the last energy level of phosphorus, atomic number 15, than there are in the last principal energy level of neon, atomic number 10?
1
3 less
5
2
An orbital may never be _____.
occupied by one electron
occupied by more than two electrons
unoccupied
occupied by two electrons
As the atomic numbers of elements increase, the numbers of electrons in the outer shells _______.
can not be determined
increase
do not change
decrease
A certain element has an atomic number of 11 and an atomic mass of 23. How many electrons are in the second principal energy level of this atom?
8
1
11
2
Ionisation energy increases down a group because the number of protons increases and it's more difficult to lose electrons because they are being pulled closer.
True
False
Which of the following has the largest ionisation energy?
Al
P
N
Si
Order the elements in decreasing ionisation energy. Na, S, Al, F, K, O
Na, S, F, K, O, Al
F, O, S, Al, Na, K
K, Na, Al, S, O, F
Al, O, K, F, S, Na
What is the definition of ionisation energy?
The energy required to add an electron
The amount of energy to attract or bond an electron
The energy required to remove an electron
None of the above
Which of the following elements is in period 6 and group 4?
Hf
C
Ge
Zr
Compared with halogens, an alkali metal in the same period has ________ electronegativity.
larger
the same
smaller
Which member of the alkaline metals has the highest electronegativity?
Sodium (Na)
Potassium (K)
Rubidium (Rb)
Lithium (Li)
Which of the following is the correct definition for electronegativity?
All of the above correctly explain electronegativity
The amount of energy required to remove an electron
The amount of energy to attract or bond electrons
Half the distance between the nuclei of two bonded atoms
You just discovered a new element, why is the periodic table helpful?
Scientists can send it to space
So scientists can have the chance to name an element after themselves
The periodic table is not helpful at all
Scientists can predict chemical and physical properties because of other elements in its family
Group I and Group VII elements form halides with the general formula:
M2X
MX2
MX
M2X2
Period 3, Group III element bonds with Oxygen to form an oxide in the following ratio:
X2Y3
XY
X3Y2
X2Y2
What is the correct name for a water molecule?
Hydrogen monoxide
Dihydrogen monoxide
Hydrogen dioxide
Dihydrogen dioxide
