11.2 Flashcards
(9 cards)
1
Q
atomic number
A
the number of protons in the nucleus of an atom
2
Q
atomic mass
A
The average mass of all the isotopes of an element
3
Q
mass number
A
the sum of the number of neutrons and protons in an atomic nucleus
4
Q
Ion
A
A charged atom
5
Q
Isotope
A
An atom with the same number of protons and a different number of neutrons from other atoms of the same element.
6
Q
Nuetron
A
A small particle in the nucleus of an atom, with no electrical charge
7
Q
Proton
A
A subatomic particle that has a positive charge and that is found in the nucleus of an atom
8
Q
Electron
A
A subatomic particle that has a negative charge
9
Q
Amu
A
atomic mass unit
