12/4/14 Flashcards
1
Q
Electron
A
A substomic particle that has a negative charge
2
Q
Nucleus
A
In physical science an atoms central region which is made up of protons and neurons
3
Q
Electron cloud
A
Regions around the atoms where electrons are likely to be found
4
Q
Proton
A
Positively charged particles in the nucleus
5
Q
Atomic number unit
A
The SI unit used to express the mass of particles in the atom
6
Q
Neutron
A
Are the particles of the nucleus that have no electrical charge
7
Q
Atomic number
A
The number go protons in the nucleus of an atom is the atomic number of that atom
8
Q
Isotopes
A
They have the same number of protons but different neutrons
9
Q
Mass number
A
The sum of protons and neutrons in an atom
10
Q
Atomic mass
A
The mass of an atom expressed in atomic mass units
