The Periodic Table

The order of elements in the periodic table is based on

• the number of protons in the nucleus.

• the electric charge of the nucleus.

• the number of neutrons in the nucleus.

• atomic mass.

Atoms of elements that are in the same group have the same number of

• protons.

• neutrons.

• valence electrons.

• protons and neutrons.

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Which of the following elements is an alkali metal?

• calcium

• magnesium

• mercury

• sodium

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Each column of the periodic table is

• an element.

• a group.

• an isotope.

• a period.

The three main groups of elements are metals, nonmetals, and

• inert gases.

• alkali metals.

• radioactive isotopes.

• semiconductors/metalloids.

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Most elements are

• metals.

• nonmetals.

• metalloids.

• semiconductors.

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Metals tend to be

• gases.

• dull.

• brittle.

• good conductors.

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Which group is very stable due to the fact that they have a full outermost orbital of electrons?

• alkali metals

• halogens

• alkaline-earth metals

• noble gases

Which of the following is a property of group 18 elements?

• malleable

• brittleness

• high electrical conductivity

• unlikely to react with other elements

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In an element box, the number at top is the

• atomic number

• atomic name

• atomic mass

• atomic symbol

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