The Atoms Family They’re tiny and they’re teeny, Much smaller than a beany They never can be seeny, The Atoms Family.

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Presentation transcript:

The Atoms Family They’re tiny and they’re teeny, Much smaller than a beany They never can be seeny, The Atoms Family.

What is an atom and where are they found? 1.All matter is made of atoms. 2.They are the smallest part of an element.

Atomic Theory

What makes up the inside of an atom? Nucleus 1.Center of atom 2.Small, dense 3.Has a positive charge (+1) 4.Contains protons and neutrons (0- no charge) Proton = positive Neutron = NO charge (neutral)

What makes up the outside of an atom? 1.Made up of electrons that are moving around outside of nucleus 2.Have a negative charge (-1) Electron Cloud

electron e-e-e-e-0 proton p+p+p+p++11 neutron n0n0n0n001

Why are all Atoms Electrically Neutral? IMPORTANT #protons = #electrons 1.Normally in an atom the number of electrons is equal to the number of protons in the nucleus. 2.The positive and negative charges cancel each other out. 3.Therefore, the atom is said to be electrically neutral.

VALENCE ELECTRONS 1.Are the electrons found in the outermost energy level of an atom 2.Determine how an atom behaves and its chemical properties Carbon has a total of 6 electrons. It has 4 valence electrons.

OCTET RULE 1.The first energy level can hold ONLY 2 electrons. 2.Second energy level can hold up to 8 electrons. 3.Third energy level can hold up to 18 electrons.

Quick Question 1 What is the positive part of the atom’s nucleus?

Quick Question 2 Where are the electrons found?

Quick Question #3 How many electrons can the first energy level hold?