A member of the boron family has three valence electrons, while a member of the nitrogen family has

One twelfth the mass of a carbon-12 atom is used to define a(n)

The atomic mass of an element is

Atoms of the most reactive elements tend to have

Compared with Group 2A elements, group 6A elements have

Moving from left to right across a row of the periodic table, which of the following values increases by exactly one from element to element

As you move from left to right across a period, the number of valence electrons

Which element is found in most of the compounds in your body except for water

Two highly reactive elements in period 2 are the metal lithium and the

The unit for atomic mass is

Among the alkali metals, the tendency to react with other substances

At room temperature, none of the metals are

Which of the following gases emit colors when an electric current is applied?

The tendency of an element to react is closely related to

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