Atomic Sturucture & Periodic Table Flashcards
1
Q
Atom
A
The smallest unit of matter that has the properties of an element
2
Q
Proton
A
A positively charge subatomic particle in the nucleus (+1)
3
Q
Neutron
A
neutral subatomic particle in the nucleus (0)
4
Q
Electron
A
A negatively charged subatomic particle outside the nucleus (-1)
5
Q
Nucleus
A
The center of an atom it has protons and neutrons
6
Q
Atomic number
A
The number of protons in an atom identifies the atom
7
Q
Mass number
A
The total number of protons and neutrons
8
Q
Group
A
The column on the periodic table, has the same number of valence electrons
9
Q
Period
A
Rows on the periodic table
10
Q
Valence electrons
A
The electrons in the outer most energy shell they determine reactivity
