The Periodic Table

An element that is shiny and conducts electric current is likely to be a ...

The element symbol for copper is ...

In a modern periodic table, elements are arranged in order of ...

Mendeleev arranged the elements in his periodic table in order of ...

A good test for the correctness of a scientific model is whether the model ...

Because they are so reactive, alkali metals are found in nature only ...

Elements that have the same number of valence electrons are ...

Copper is an example of ...

An atomic mass unit (amu) is ...

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

The most reactive metals are the ...

How many periods does the periodic table have?

Mendeleev arranged his table so that elements with similar properties were in the same ...

Across a period from left to right, the elements become less ... and more ...