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Mendeleev arranged the elements in his periodic table in order of what?


Mendeleev's decision to leave gaps in his periodic table was supported by the discovery of what?


In the modern periodic table, elements are arranged in order of what?

Atomic number

How many periods does the periodic table have?


An atomic mass unit is what?

the twelfth the mass of a carbon -12

An element that is shiny and conducts electric currents is likely to be a what?


Copper is an example of what?

transition metal

Elements that have the same number of valence electrons are what?

in the same group

The most reactive metals are the what group?

Alkali metals

Which group are all gases at room temp.?

Group 8A

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