Vocab 1
Atom
Smallest unit of an element.
Molecule
Two or more atoms
Period
A row of elements
H
Hydrogen
Helium
He
Ion
Charged atom or molecule.
Conductor
Most of the elements- good at conducting heat and electricity.
Group
Au
Gold
Uranium
U
Cation
Positive charge
Metalloid
Properties of both metals and nonmetals
Who was Mendeleev? How did he organize the Periodic Table?
First to make periodic table- arranged it by atomic mass.
Hg
Mercury
Copper
Cu
Anion
Negative charge
Periodic Law
Arrangement of the periodic table based on physical and chemical properties
Least reactive group
Noble gases
Sn
Tin
Potassium
K
Electronegativity
Periodic table trend- how electrons attract atoms
Reactivity
Elements ability to ionize or share electrons
Most reactive group of elements. Why?
Group 1- they have 1 valence electron.
P
Phosphorus
Sodium
Na