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Fenster schliessen

What is a peridoic table and who did develop it?

It was developed by Dimitri Mendeleev who organised elements bades on increasing molar mass and similar properties, not by atomic number. 

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What is the periodic law?

The properties of elemtns repeat in pattern on the periodic table when they are organized by increasing atomic mass.

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What is a period?

horizontal row on periodic table. Elements in a period have the same number of shells (energy levels).

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What is a group/family?

vertical columns on peridoic table. Elements within a group have similar properties, numbers on top of the periodic table indicate the group #.

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What are the main group?

the eight "tallest" columns on the periodic table, groups 1,2 & 13-18

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What are the transition metals?

groups 3-12, have greater complexity in electron configuration, many of these can form more than one type of ion

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list the properties of metals

- hight melting points (all execpt mercury are solid at room temperature)

- shiny when freshly cut or polished

- malleable (dehnbar) -> can pushed into a sheet

- ductile (plastisch verformbar) -> can be pulled into thin water 

- generally flexible as thin sheets or wires

- good conductors of heat and elctricity

- tend to lose electrons and form positive ions when reacting

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list the properties of non-metals

- lower melting points

- solids are not malleable, ductile or flexible

- poor conductors of heat and electricity 

- tend to gain electorns and form negative ions when reacting or will share electrons when reacting with other non-metals