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WorksheetsUnit 8 Review
Total questions: 48
Worksheet time: 26mins
When neutrally charged, atomic number equals the number of _________.
Protons or Electrons
Protons or Newtons
Neutrons or Electrons
Protons or Neutrons
The mass number is equal to the number of _________.
electrons and protons
Subtracting the atomic number from the mass number will give you the number of _________.
Two different isotopes of the same element have different numbers of _________.
Unstable isotopes that emit radiation and decay into other isotopes are known as __________.
Chemical isotopes
Radioisotopes
Nuclear-isotopes
Stable isotopes
Electrons are spread throughout the atom, like blueberries in a muffin. What model is this describing?
Plum-Pudding
Cathode Ray
Anode Ray
Rutherford
Which of the following is the central region of an atom?
Core
Isotope
Nucleus
Orbital
What are the four types of electron orbitals in order?
s, p, d, q
w, a, s, d
s, p, f, u
s, p, d, f
What is the formula for calculating the number of neutrons in an atom?
Mass number - Atomic number
Atomic number - Mass number
Mass number + Atomic number
Atomic number + Electrons
Which subatomic particle has a negative charge?
Proton
Neutron
Electron
Nucleus
Which subatomic particle has a neutral charge?
Proton
Neutron
Electron
Nucleus
Which subatomic particle has a positive charge?
Proton
Neutron
Electron
Nucleus
Which scientist proposed that the atom is mostly empty space with a small, dense nucleus?
Thomson
Dalton
Rutherford
Bohr
Avogadro's number is approximately:
6.02 × 10^22
6.02 × 10^23
6.02 × 10^24
6.02 × 10^25
The molar mass of an element is:
The mass in grams of one atom
The mass in grams of 6.02 × 10^23 atoms
Equal to its atomic number
Equal to its mass number
The electrons in the outermost energy level of an atom are called:
Valence electrons
Core electrons
Primary electrons
Shell electrons
The atomic number of an element is determined by:
The number of electrons
The number of protons
The number of neutrons
The sum of protons and neutrons
Which model of the atom introduced energy levels for electrons?
Thomson's model
Rutherford's model
Bohr's model
Dalton's model
Isotopes of an element have the same:
Number of neutrons
Number of protons
Atomic mass
Mass number
Neutrons are found in the nucleus of an atom.
True
False
The mass of an electron is approximately equal to the mass of a proton.
True
False
Isotopes of the same element have different chemical properties.
True
False
The quantum mechanical model replaced the Bohr model because it better explained observed atomic behavior.
True
False
One mole of any substance contains exactly 6.02 × 10^23 particles.
True
False
The atomic mass listed on the periodic table is the average of all naturally occurring isotopes of that element.
True
False
Thomson's model of the atom was disproved by the gold foil experiment.
True
False
In a neutral atom, the number of protons equals the number of electrons.
True
False
The 3rd energy level can hold a maximum of 10 electrons.
True
False
The number of valence electrons determines an element's chemical properties.
True
False
The principal quantum number (energy level = n) can have a value of zero.
True
False
How many moles of mercury (Hg) are in a 521 g sample? (Hg atomic mass = 200.6 g/mol)
2.6 mol
0.4 mol
104,626.6 mol
200.6 mol
How many grams of sodium (Na) are in 4.9 moles? (Na atomic mass = 23.0 g/mol)
4.7 g
112.7 g
23.0 g
0.2 g
How many moles of carbon are in a 51.92 g sample? (C atomic mass = 12.0 g/mol)
4.3 mol
0.2 mol
623.0 mol
12.0 mol
How many grams of carbon dioxide (CO2) are in 15.22 moles? (CO2 molar mass = 44.0 g/mol)
0.3 g
669.7 g
44.0 g
59.2 g
In a Bohr model of Carbon, how many electrons would be in the first energy level?
2
4
6
8
In a Bohr model of Aluminum (Al), how many electrons would be in the third energy level?
1
3
8
13
In a Bohr model, the maximum number of electrons in the second energy level is:
2
6
8
18
Match each scientist with their contribution to atomic theory:
Used the Plum Pudding Model to help explain his findings.
Thomson
First to determine that the world is made up of tiny indivisible units called atoms.
Democritus
Stated that electrons move around the nucleus in orbits, like planets and their orbits around the sun.
Bohr
Developed a simplified way of representing the valence electrons in an element or compound.
Lewis
Label the following diagram
How many protons are in this ion?
23
11
12
8
How many electrons are in this ion?
23
11
12
8
How many neutrons are in this ion?
23
11
12
8
What is the mass number of this element?
8
16
24
15
How many electrons does this ion have?
82
79
197
118
How many protons does this ion have?
82
79
197
118
How many neutrons does this ion have?
82
79
197
118
Predict the product
