Atomic Structure And Periodic Table Flashcards
1
Q
Atom
A
Smallest unit of matter that has the properties of an element
2
Q
Proton
A
Positively charged subatomic particles in the nucleus (+1)
3
Q
Nucleus
A
Neutral subatomic particle in the nucleus (0)
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 + number of neutrons
8
Q
Group
A
Column in 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
