"Building block" of all matter that surround us.
Atom
Greek philosopher who suggested that everything was made up of tiny pieces.
Democritus
Substance that is made of just one kind of atom.
Element
Group of atoms joined tightly together.
Molecule
A molecule of oxygen is made from ............. atoms of oxygen joined together.
Two
The chemical symbol for .................. is O.
Oxygen
The chemical symbol for .................. is He.
Helium
The chemical symbol for .................. is Na.
Sodium
The chemical symbol for .................. is Cl.
Chlorine
The chemical symbol for .................. is C.
Carbon
Element or Compound?
Compound
Element or Compound?
Element
The rows in the Periodic Table are called...
Periods
The columns in the Periodic Table are called..
Groups
When you read each row across the Periodic Table, from left to right, the mass of the atoms ........................
Increase
Element with the smallest mass in the Periodic Table.
Hydrogen
