The Current Atomic Model

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Presentation transcript:

The Current Atomic Model

Atomic Structure All Material are ultimately made up of atoms. Atoms are the smallest ‘building block’ of matter. Each element has a set number of protons eg. Hydrogen has 1 proton, Helium 2 protons and Gold 79 protons

Atomic Structure Electrons in shells The Nucleons in the Nucleus Proton Neutrons

C 12 6 The total number of protons and neutrons in an atom is called its mass number. C 12 6 The number of protons in an atom is called its atomic number.

Number of Electrons = Number of Protons In a atom… Number of Electrons = Number of Protons

Electron Configuration

Electron Configuration The first shell can hold 2 electrons The second shell can hold 8 electrons The third shell can hold 8 electrons The fourth shell can hold 2 electrons The electrons always fill up the lowest shell before any other

H

He

Li

Be

B

C

N

O

F

Ne

Na

Mg

Al

Si

P

S

Cl

Ar

K

Ca

Number of Electrons = Number of Protons In a atom… Number of Electrons = Number of Protons This means atoms are electrically neutral If electrons are added or removed then the atom becomes a charged particle we call an ion

Sodium Atom Chlorine Atom

Positive Sodium Ion Negative Chlorine Ion