WorksheetsAtom Basics
Total questions: 20
Worksheet time: 10mins
Atomic number, Z = _____.
the number of protons.
the number of neutrons.
the number of electrons, always.
the mass of the atom in amu.
Protons, p+, = the _____, in a neutral atom.
mass number
number of neutrons
molar mass
number of electrons
Protons (p+) + ________ = mass number (A).
electrons
molar mass
neutrons
quarks
___________ - atomic number (Z) = number of neutrons (n0).
Average atomic mass
Mass number
Electrons
Molar mass
Relative atomic mass (Ar) rounded off = ____ of the most common isotope.
atomic number
mass number
electons
neutrons
Consider gold, Au, element 79. A gold atom has _____ protons.
79
197.0 amu
118
276
A gold atom's relative atomic mass (Ar) is _____.
79
197.0
276
118
The mass number (A) of the most common isotope of gold is _____.
79
197 amu
118
276
The atomic number (Z) of gold is _____.
79
197
118
276
A gold atom, in it's neutral state, has _____ electrons.
79
197
118
276
The most common isotope of gold has ____ neutrons.
79
197
118
276
For gold, ____ electrons are found in the 5th energy level (n= 5).
79
32
19
197
For gold, _________ electrons are found in the 3rd energy level (n = 3).
2
8
18
32
19
_____ neutrons are found in an oxygen-18 atom. (Oxygen is element 8).
8
16
10
9
____ electrons are found in a neutral sodium (Na) atom. (Sodium is element 11).
11
22.99
23
12
____ electrons are found in a sodium ion (Na+).
11
12
23
10
Consider the mass notation for the most common isotope of gold. The number to the upper left of the symbol will be the _______.
mass number
atomic number and number of protons
number of electrons
number of neutrons
Consider the mass notation for the most common isotope of gold. The number to the lower left of the symbol will be the _______.
mass number
atomic number or number of protons
number of electrons
average atomic mass
Which diagram has the correct Bohr diagram for carbon, C, Z= 6?
A
B
C
D
Which picture show the correct Bohr diagram for calcium, Ca, Z = 20?
A
B
