Atomic Structure Periodic Table Vocab. Flashcards
1
Q
Atom
A
Smallest unit of matter that has the properties of an element
2
Q
Proton
A
Are positively charged subatomic particle in the nucleus (+1)
3
Q
Neutron
A
Neutral subatomic particle in the nucleus (0)
4
Q
Electrons
A
Negatively charge subatomic particle outside the nucleus (-1)
5
Q
Nucleus
A
The Center of an atom, it has the protons neutrons
6
Q
Atomic number
A
The number of protons, identifies an atom
7
Q
Mass number
A
Number of protons +number of 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 outer most energy shell, they determine reactivity
