WorksheetsScience 8 - Review Session
Total questions: 40
Worksheet time: 21mins
Which of the following is a compound?
Helium (He)
Nitrogen (N₂)
Carbon monoxide (CO)
Aluminum (Al)
Which of the following is an element?
Water (H₂O)
Carbon dioxide (CO₂)
Oxygen (O₂)
Sodium chloride (NaCl)
Which of the following is a chemical property of matter?
Which state of matter has a definite shape and volume?
Which state of matter has particles that are free to move in all directions and take the shape of their container?
Which of the following is a physical change?
Burning wood
Rusting iron
Cooking an egg
Which process describes a solid turning directly into a gas?
The mass number of an element is the sum of:
Protons and electrons
Electrons and neutrons
Protons and neutrons
Neutrons and isotopes
An element has an atomic number of 22. How many protons does it have?
11
12
22
A neutral atom of carbon has 6 protons. How many electrons does it have?
If an atom has 8 protons and neutrons of 4, what is its mass number?
12
6
4
An element has an atomic number of 45 and a mass number of 60. How many neutrons does it have?
15
105
60
30
A potassium (K) atom has 19 protons and a mass number of 39. How many neutrons does it have?
A sulfur atom has an atomic number of 16 and a mass number of 32. How many neutrons does it contain?
Who proposed that matter is composed of small, indivisible particles called "atomos"?
JJ Thomson
John Dalton
Neils Bohr
What was the key feature of J.J. Thomson’s "Plum Pudding" model?
Electrons orbit the nucleus in fixed energy levels
Atoms are mostly empty space
Electrons are scattered inside a positively charged "pudding"
Neutrons balance the charge of protons
Who discovered the neutron in an atom?
Who discovered the nucleus using the gold foil experiment?
According to Bohr’s atomic model, where can electrons be found?
Moving freely around the nucleus
Inside the nucleus
In fixed orbits or energy levels
Mixed with protons and neutrons
How many quantum numbers are used to describe the position of an electron?
The principal quantum number l indicates:
The shape of the orbital
The energy level of the electron
The spin direction of the electron
The number of protons in the atom
Which quantum number describes the shape of the orbital?
What is the maximum number of electrons that can occupy the 2nd energy level?
Which set of quantum numbers is valid for an electron in the 3p3 orbital?
(n =3, l=1, ml=+1, ms= +1/2)
(n=4, l=1, ml=0, ms=+1)
(n=3, l=2, ml=1, ms=+1/2)
(n=2, l=1, ml=0, ms=+1/2)
What is the electron configuration of oxygen (O), which has 8 electrons?
1s² 2s² 2p⁴
1s² 2s² 2p²
1s² 2p⁶
1s² 2s² 3s²
If an element has the electron configuration 1s² 2s² 2p⁶ 3s¹, what is the element?
According to Hund's rule, electrons will:
Pair up in orbitals before occupying empty ones
Fill lower energy orbitals first
Occupy orbitals singly before pairing up
Have the same spin in the same orbital
Which statement is true regarding electron spin in the same orbital?
Both electrons spin in the same direction
Electrons have opposite spins
Only one electron can occupy an orbital
Electrons do not spin
What does an arrow in an orbital diagram represent?
What element do the orbital diagram illustrated?
Oxygen
Sulfur
Nitrogen
Aluminum
Which of the following is the orbital diagram of Aluminum?
Which of the following is a general property of metals?
Poor conductors of heat
Brittle and dull
Malleable and ductile
Non-reactive with acids
Metalloids have properties that are:
Exactly like metals
Exactly like nonmetals
A mix of metals and nonmetals
Neither metallic nor non-metallic
Which of the following elements is a metal?
Which of the following elements is a nonmetal?
Calcium
Magnesium
Where are the nonmetals located on the periodic table?
Left-hand side
Right-hand side
Middle
Top
What are valence electrons?
Electrons in the nucleus
Electrons in the outermost shell of an atom
Electrons in the innermost shell
Electrons that have no energy
Which group in the periodic table has 1 valence electron?
How many valence electrons does an element in Group 17 (Halogens) have?
Which element has 2 valence electrons and belongs to the alkaline earth metals?
