Atomic Structure Vocab Flashcards
1
Q
Atom
A
the smallest unit of matter that has the properties of an element
2
Q
Proton
A
positively charged subatomie paracle in the nucleus +1
3
Q
Neutron
A
neutral Subatomie particle in the nucleus o)
4
Q
Electron
A
negatively charged subatomic particle outside the nucleus (-I)
5
Q
Nucleus
A
center of an atom, has protons - neutrons
6
Q
Atomic number
A
number of protons in an atom, identfies the atom
7
Q
Mass number
A
the number Droton + neutrons
8
Q
Group
A
coulam on the periodic table, nas the same number uf valence cleroes
9
Q
Period
A
Now on the periodic table
10
Q
Valence electron
A
elections in the determine outermost energy shell. They decide reactivity
