Atomic Structure And Periodic Table Vocab Flashcards
1
Q
Atom
A
Smallest unit of matter that has the properties of an element.
2
Q
Protons
A
Positively charged subatomic particles in the nucleus. (+1)
3
Q
Neutron
A
Neutral subtonic particle in the nucleus. (0)
4
Q
Electrons
A
Negatively charged subtonic particle outside the nucleus. (-1)
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 and 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 outermost energy shell. They determine reactivity.
