A piece of aluminum foil has a mass of 27 grams. About how many atoms does this contain? (Aluminum has a molecular mass of 27 g/mol.)
3.01 x 10^23 atoms
27 atoms
1.20 x 10^24 atoms
6.02 x 10^23 atoms
A computer chip contains 1.20 x 10^23 atoms of silicon. What is its mass? (The molecular mass of silicon is 28 g/mol.)
2 grams
5.6 grams
14 grams
6.02 x 10^23 grams
Which of the following was the instrument used for the discovery of the electron?
Alpha particle emitter
Cathode ray tube
Oil drop apparatus
Gold foil experiment
Which of the following is an example of when an electron absorbs energy?
When it goes from the fourth energy level to the first.
When it goes from the second energy level to the fourth.
When an electron releases a photon.
When it maintains constant energy and doesn't change .
Which rule states that electrons will go into empty orbitals of the same energy before entering into an orbital with an electron present?
Pauli Exclusion Principle
Hund's Rule
Aufbau Principle
Hand's Rule
What does the Pauli Exclusion Principle deal with?
electron charge
none of these are correct
electron spin
electron speed
What is the name of the constant in the Heisenberg Uncertainty Principle equation?
Planck's
de Broglie
Heisenberg's
Einstein's
What is the term for the number of peaks that pass through a fixed spot during a given time interval?
frequency
wavelength
wavespeed
Planck's constant
What is the main point of the de Broglie equation?
matter only behaves like a particle
the position of light cannot be precisely determined
Einstein's theory of relativity was incorrect
matter has wave-like properties
Which block is manganese (Mn) located in?
p-block
f-block
s-block
d-block
How are isotopes of the same element similar?
They have the same number of neutrons.
They are equally abundant in nature.
They have the same number of protons.
They have the same mass.
Magnesium has three common isotopes. Based on its average atomic mass, which is the most common?
Magnesium-26
Magnesium-25
Magnesium-24
Magnesium-12
Which of the following has a positive charge and a mass of one amu?
Chemical bonds
Protons
Neutrons
Electrons
How many electrons can fit into the p subshell?
6
10
5
2
Which of the rules discussed in this lesson relates to the spin of electron in an orbital?
Hund's rule
None of these discussed spin
Pauli exclusion principle
Aufbau principle
What is the largest principal quantum number that a calcium electron can have?
n = 0
n = 1
n = 4
n = 2
