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
Neural subatomic particle in the nucleus (0)
4
Q
Electron
A
Negatively charged subatomic particle outside the nucleus (-1)
5
Q
Nucleus
A
Center of an atom, has protons + neutrons
6
Q
Atomic number
A
Number of protons in an atom, identifies an atom
7
Q
Mass number
A
The number proton + neutrons
8
Q
Group
A
Column on the periodic table, has the same number of valence electrons
9
Q
Period
A
Row on the periodic table
10
Q
Valence electrons
A
Electrons in the outermost energy shell. They determine reactivity.
24-25 Science
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