3.2 More about Atoms Flashcards
1
Q
Subatomic particles
A
Atoms have protons and neutrons in the nucleus and a cloud of electrons that moves around the nucleus.
2
Q
How is their mass measured?
A
Their mass is measured in atomic mass units.
3
Q
Proton
A
1 unit, 1+ charge
4
Q
Neutron
A
1 unit, neutral charge
5
Q
Electron
A
Almost nothing, 1- charge
6
Q
Atomic number
A
The atomic number or the proton number is the number of protons in the nucleus of an atom.
7
Q
Overall Charge
A
Every atom has an equal number of protons and electrons to have no overall charge.
8
Q
Nucleon number
A
Protons and neutrons form the nucleus so are called nucleons. The total number of nucleons is called its nucleon number or mass number.
