"Building block" of all matter that surround us.
Atom
How many Elements we currently have?
118
The person behind the modern periodic table.
Dmitri Mendeleev
Substance that is made of just one kind of atom.
Element
Group of atoms joined tightly together. Like Ozone
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 Fe.
Iron
The chemical symbol for .................. is Na.
Sodium
The chemical symbol for .................. is Cl.
Chlorine
The chemical symbol for .................. is C.
Carbon
H2O is a/an (compound, molecule, element)
Compound
Element or Compound? GOLD Au
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/decrease).
Increase
