Atoms Flashcards
1
Q
Atom
A
The smallest unit of mater that has the properties of an element
2
Q
Protons
A
Positively charged subatomic particles in the number
3
Q
Neutron
A
Neutral subatomic particles in the nucleus
4
Q
Election
A
Negative charged subatomic particles outside the nucleus
5
Q
Nucleus
A
Center of an atom contains protons plus neutrons
6
Q
Atomic number
A
Number of protons and identifies the atom
7
Q
Mass number
A
Number of protons and neutrons
8
Q
Group
A
A Column on the periodic table has the same number of valance electrons
9
Q
Period
A
Row on the periodic table
10
Q
Valence electrons
A
Electrons in the outermost energy shell they determined reactivity
