noble gases are known as ________.
A
ionic gases
B
inert gases
C
metalloid gases
D
ductile gases
B
inert gases
he three main subatomic particles that make up an atom are ________.
A
neutrons, protons and molecules
B
neutrons, protons and ions
C
ions, electrons and newtons
D
electrons, neutrons and protons
D
electrons, neutrons and protons
Elements in a vertical column on the Periodic Table have similar properties and are all members of the same ________ of elements.
A
molecule
B
phase
C
atom
D
group
D
group
The number of protons in an atom is known as its atomic ________.
A
number
B
mass
C
phase
D
bond
A
number