Structure of an atom grade 9

What is an atom

An element is a substance made of only one type of atom

FACTS

An atom is mostly empty space

It has a nucleus in the middle consisting of protons

Where is everything in an atom? Protons? Electrons? Neutrons?

Neutrons- inside nucleus

Protons- inside nucleus

Electrons- OUTSIDE nucleus

how does SAN go?

Atomic mass —-SYMBOL

atomic #

What is the Bohr Rutherford rule? What goes in shells?

Rule: 2-8-8

Shells- # of protons

MOLECULES

Two of THE SAME atoms bonded together

All compounds are molecules, but not all molecules are compounds.

COMPOUNDS

A compound is a molecule made of atoms from DIFFERENT elements

All compounds are molecules, but not all molecules are compounds.

What family is where?

1. alkali metals

2. AlkaLINE earth metals

3. Transition metals

4. Metalloids

5. Non-metals

6. Halogens

7. Noble gases

PERIODS VS. FAMILES

Elements in a period are NOT ALIKE.

Elements in a group are similar.