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WorksheetsMid-Unit Review 2020-2021
Total questions: 20
Worksheet time: 30mins
What is the atomic number of an element equal to?
the number of protons plus the number of neutrons in a nucleus
the number of protons in a nucleus
the number of protons plus the number of electrons in an atom
the number of electrons circling the nucleus of an atom
An atom has an atomic number of 42 and a mass number of 75.
How many protons does it have?
21
42
33
75
Isotopes exist between atoms because the differ in which of the following?
number of protons in the nucleus
number of neutrons in the nucleus
number of electrons in the atom
number of protons and electrons in the atom
Which of the following have an atomic mass of 46.12 amu
What is the mass this isotope Am-243?
95
148
243
35
What must occur for an electron to move to a lower energy level?
The electron must collide with the nucleus.
The electron must release energy through fission.
The electron must transfer energy to another electron.
The electron must lose energy.
Who developed the orbital model of the atom?
J.J. Thomson
Ernest Rutherford
Niel Bohr
Democritus
How many neutrons does Hydrogen have?
0
1
2
1.008
How many neutrons does Argon (Ar) have?
39
18
22
40
What is my favorite element?
Thorium (Th)
Erbium (Er)
Einsteinium (Es)
Uranium (U)
All matter is made up of what?
energy
atoms
electrons
quartz
The neutral particles of an atom are...
atoms
neutrons
electrons
protons
The center of an atom, where the protons and neutrons are located is called the _____________
center
middle
nucleus
orbital
You can calculate the number of neutrons in an element with what information?
element symbol
atomic number
mass number
charge
What determines an atom's identity?
The isptope
Atomic Number
Electrons
Neutrons
What is the correct isotope notation for a Carbon atom with 7 neutrons?
C-7
C-13
C-14
C-6
Where do valence electrons reside?
around the nucleus
the outer most orbital
in the nucleus
in the cell of an atom
When electrons gain enough energy what happens?
They stay in the same orbital
They move to a lower energy level
They move to a higher energy level
They become a new element
Bohr's model of an atom explains which of the following
How electrons reside between orbitals
That electrons are negative
That electrons are always in motion
The placement of electrons in specific orbitals
What day of the week are classes optional?
Monday
Tuesday
Thursday
Friday
