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“periodic”= regular, repeated pattern

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Presentation on theme: "“periodic”= regular, repeated pattern"— Presentation transcript:

1 “periodic”= regular, repeated pattern

2 Dmitri Mendeleev Russian Chemist Studied phys. Properties of elements
Created PT in 1869 Arranged in order of increasing atomic mass Predicted undiscovered elements

3 Mendeleev’s PT published 1869

4 Henry Moseley English physicist who studied under Rutherford
Improved PT by arranging in order of increasing atomic #

5 PERIODS Rows across the PT Atomic # increases from left to right Physical & Chemical properties change in predictable patterns Numbered 1 to 7 down side

6 Period # = number of energy levels/electron shells
Lithium Period 2 Sulfur Period 3

7 Groups/ Families Elements in same column (up & down)
Numbered 1-18 across top of PT Share similar physical & chemical properties

8 Group # = # of valence electrons
Magnesium Group 2 = 2 valence e- Neon Group 18 = 8 valence e-

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