Module 13 Vocabulary Flashcards
1
Q
Model
A
A schematic description of a system that accounts for its known properties.
2
Q
Nucleus
A
The center of an atom, containing the protons and neutrons.
3
Q
Atomic Number
A
The number of protons in an atom
4
Q
Mass Number
A
The sum of the numbers of neutrons and protons in the nucleus of an atom.
5
Q
Isotopes
A
Atoms with the same number of protons but different numbers of neutrons.
6
Q
Element
A
A collection of atoms that all have the same number of protons.
7
Q
Radioactive Isotope
A
An atom with a nucleus that is not stable.
8
Q
Half-life
A
The time it takes for half of the original sample of a radioactive isotope to decay.
