Atomic Structure + Periodic Table Vocab Flashcards
1
Q
Atom
A
The smallest unit of matter that has the same properties of an element.
2
Q
Proton
A
Positively charged subatomic particle in the nucleus (+1)
3
Q
Neutron
A
Neutral subatomic particle in the nucleus (0)
4
Q
Electron
A
Negatively charge subatomic particle outside the nucleus.(-1)
5
Q
Atomic Number
A
The number of protons in an atom. It identifies the atom.
6
Q
Mass Number
A
The number proton + neutrons
7
Q
Group
A
Column on the periodic table, has the same number of valence electrons.
8
Q
Period
A
Row on the periodic table.
9
Q
Valence electrons
A
Electrons in the outermost energy shell. They determine reactivity.
10
Q
Nucleus
A
Center of atom, has protons and neutrons.
