Why do you think the rules and routines are being reemphasized today?

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Presentation transcript:

Why do you think the rules and routines are being reemphasized today? 10/16/12 Why do you think the rules and routines are being reemphasized today?

The Periodic Table

Dmitri Mendeleev Russian Chemist

He discovered similarities in elements

Properties included atomic mass, density, color, melting point and bonding power.

He made elements fit into columns He made elements fit into columns. Empty spaces were elements not yet discovered….

The table was still missing some elements…

Henry Moseley Arranged elements by atomic number, not mass.

The periodic table has columns

The periodic table has rows

Element Key