1
Q
Atom
A
The smallest unit of matter that has the properties of an element.
2
Q
Proton
A
Positively charged subatomic particle in the nucleus (+1)
3
Q
Neutron
A
Neutral subatomic particle in the nucleus (0).
4
Q
Electron
A
Negatively charged subatomic particle outside the nucleus (-1)
5
Q
Nucleus
A
Center of anthem has protons + neutrons
6
Q
Atomic number
A
Number of protons in the atom identifies the atom.
7
Q
Mass number
A
The number of protons + neutrons.
8
Q
Group
A
Column on the periodic table has the same number of valnce electrons
9
Q
Period
A
Row on the periodic table
10
Q
Valence electrons
A
Electrons in the outermost energy shell. They determine reactivity.
Sience 24-25
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