Atoms Flashcards
1
Q
Atom
A
The smallest unit of matter that has the properties of an element
2
Q
Protons
A
Positively charged sub atomic particles in the nucleus
3
Q
Neutron
A
Neutral subatomic particle in the nucleus
4
Q
Electron
A
Negatively charged subatomic particle outside the nucleus
5
Q
Nucleus
A
Center of an atom has protons and neutrons
6
Q
Atomic number
A
Number of protons identifies an atom
7
Q
Mass number
A
Number of protons plus number of neutrons
8
Q
Group
A
Column on the patriotic table has the same number of valence electrons
9
Q
Period
A
Row on the periodic table
10
Q
Valance electrons
A
Electrons in the outer most energy shell, they determined reactivity
