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WorksheetsElectrons
Total questions: 20
Worksheet time: 15mins
Name
Class
Date
1.
Bohr's model of the atom proposed that ___.
a)
electrons move around the nucleus in fixed orbits
b)
neutrons move around the nucleus
c)
neutrons do not exist, but are just paired protons and electrons
d)
the nucleus spins
2.
The impossibility to know simultaneously the exact position and momentum of a particle is called the:
a)
Einstein Uncertainty Principle
b)
Moseley Uncertainty Principle
c)
Heisenburg Uncertainty Principle
d)
Bohr Uncertainty Principle
3.
Which of the following correctly describes the electron cloud model?
a)
Electrons do not follow fixed orbits, but are found more frequently in areas around the nucleus.
b)
Electrons are found in fixed orbitals around a positive nucleus.
c)
All of an atom's mass is concentrated in the electron cloud around the nucleus.
d)
Electrons are evenly embedded throughout a positively charged sphere.
4.
An atom that has gained energy beyond normal is said to be ...
a)
excited
b)
energized
c)
naturalized
d)
grounded
5.
Valence electrons are located...
a)
inside the nucleus
b)
in outer space
c)
on the outermost electron shell in an atom
d)
on the electron shell closest to the nucleus.
6.
How many electrons can fit in the first energy level?
a)
8
b)
2
c)
4
d)
6
7.
The energy of an electron __________ as it moves further away from the nucleus
a)
increases
b)
decreases
8.
When an atom has all of its electrons in the lowest energy orbitals available, the atom is
a)
in ground state
b)
in excited state
c)
giving off light energy
d)
unstable
9.
All orbitals of equal energy are occupied by one electron before any single orbital is occupied by a second electron.
a)
Aufbau principle
b)
Pauli exclusion principle
c)
Hund’s rule
d)
Core Notation
10.
An electron occupies the lowest energy orbital that can receive it.
a)
Hund’s rule
b)
Pauli exclusion principle
c)
Bohr model of the atom
d)
Aufbau principle
11.
No two electrons in the same atom can have the same four quantum numbers.
a)
Aufbau principle
b)
Pauli exclusion principle
c)
Hund’s rule
d)
Noble gas notation
12.
The position & momentum of the electron cannot be known at the same time.
a)
Planck
b)
Heisenberg
c)
de Broglie
d)
Schrodinger
13.
Why do we not use Bohr's planetary model today?
a)
it is too specific; we are not allowed to know the electron's specific location
b)
it represented the nucleus far too largely
c)
it is too vague; we have more specific information to use now
d)
it placed the electrons too close to the nucleus
14.
represents the distance the electrons are from the nucleus
a)
energy level
b)
sublevel
15.
"Electrons in the same orbital have opposite spin."
a)
aufbau principle
b)
Hund's Rule
c)
Pauli Exclusion Principle
d)
Uncertainty Principle
16.
A spontaneous process that occurs when an atom emits radiation and/or a particle from its nucleus to become more stable is __.
a)
Nuclear Reaction
b)
Radioactive Decay
c)
Half-Life
17.
The "dots" in the Boarding House (Hotel) Model represented...
a)
Protons
b)
Neutrons
c)
Electrons
d)
Atomic Number
18.
Which sublevel will be filled FIRST?
a)
3p
b)
2s
c)
2p
d)
1s
19.
What do the superscripts (exponents) in the electron configuration mean? ex. 1s22s23p4
a)
Energy level
b)
Location of orbital
c)
Number of electrons
d)
Hund's Rule
20.
The relationship between wavelength & frequency is....
a)
Directly Proportional
b)
Indirectly Proportional
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