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Dmitri Mendeleev “The elements, if arranged according to their atomic weights, exhibit an apparent periodicity of properties.”

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Presentation on theme: "Dmitri Mendeleev “The elements, if arranged according to their atomic weights, exhibit an apparent periodicity of properties.”"— Presentation transcript:

1 Dmitri Mendeleev “The elements, if arranged according to their atomic weights, exhibit an apparent periodicity of properties.”

2 Periodic Trends

3 Background image: Atomic Radius

4 1. Atomic Radius Across Period Atomic size DECREASES Because nuclear charge (# p + ) increases, as e - are added to same n, pulls e- in tighter Down Group Atomic size INCREASES Because more n (shells), more shielding, e - further away from nucleus

5 Background image: Electronegativity

6 2. Electronegativity The ability to attract e - Across Period EN INCREASES Because nuclear charge (# p + ) increases Down Group EN DECREASES Because more n, more shielding, e - further away from nucleus

7 Background image: Ionization Potential

8 3. Ionization Potential/Energy IE: Energy required to remove e - Higher the IE: more difficult to remove e - Across Period IE INCREASES* * with each subshell Why? Down Group IE DECREASES Why?

9 4. Ionic Radius Ion- Charged atom Cation Positive (+) ion (neutral atom looses e - ) Anion Negative (-) ion (neutral atom gains e - )

10 Background image: Ionic Radius

11 4. Ionic Radius Across Period IR DECREASES* * with jump up in metalloids Down Group IR INCREASES Compare to neutral atom Ex. Br Valence e - are the outermost e - of an atom

12 5. Metallic Properties Across Period MP DECREASES Down Group MP INCREASES


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