Year 9 Science

Atoms & Ions

Dr Sharma

Lesson Objective: To gain knowledge & understanding of the relationship between atoms & ions

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What’s in an Atom ???

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Atoms

ProtonsNeutrons =Electrons

Where are they in an atom ?

SUBATOMIC PARTICLES

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AtomsProtons nucleus

Neutrons nucleus

ElectronsOrbit around the nucleus in electron clouds

Cannot determine exact location

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Atoms

ProtonsNeutronsElectrons

What’s their charge ?

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Atoms

+ ProtonsNeutral Neutrons- Electrons

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Elements

Calculate the number of protons, electrons & neutrons for Na

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Isotopes

These are isotopes of Hydrogen & Helium - why ???

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Isotopes

Same number of protons

Different numbers neutrons

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Electrons – Shell Diagram

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Shell DiagramsMolecular Orbital Theory

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Can you draw shell diagram for B & P ?

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Atoms & Ions

Cation is formed when an atom loses an electronNa+Anion is formed when an atom gains an electronCl-

Looking at charge of the atom

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Let’s Build an Atom, form a cation/anionBuild an Atom

Open your devices & please go to this webpage

http://phet.colorado.edu/en/simulation/build-an-atom

Look at the charge when you add/take away

more protons or electrons. What happens????

Look at the periodic table try & make your atoms

Calculate Neutrons, Protons & Electons

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Hope you Enjoyed the Lesson