“periodic”= regular, repeated pattern

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Presentation transcript:

“periodic”= regular, repeated pattern

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

Mendeleev’s PT published 1869

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

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

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

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

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

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