Atomic Structure + Periodic Table Vocab Flashcards
1
Q
Atom
A
Smallest unit of matter that has properties of an element
2
Q
Protons
A
Positivity charged subatomic particles in (1+) the nucleus
3
Q
Neutron
A
Neutron subatomic particle in the nucleus (0)
4
Q
Electrons
A
Negatively charged subatomic particles outside the nucleus (-1)
5
Q
Nucleus
A
Center of an atom, has protons + neutrons
6
Q
Atomic number
A
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 Electron
A
Electrons in the outermost energy shell. They determine reactivity.