The order of elements on 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

Semiconductors are elements that

• have large atomic masses but small atomic numbers.

• do not form compounds.

• can conduct heat and electricity under certain conditions.

• are extremely hard.

Carbon and other nonmetals are found in which area of the periodic table?

• on the left-most side

• on the right side

• in the middle column of the periodic table

• in the bottom rows

In Mendeleev's periodic table, elements in each column had similar

• atomic masses.

• properties.

• atomic numbers.

• symbols.

Magnesium (Mg) is located to the sight of sodium (Na) because MG has

• fewer protons.

• no neutrons.

• no protons.

• more protons.

As you move from left to right across the periodic table, elements

• become less metallic.

• have a lower atomic number.

• have a lower atomic weight.

• become more metallic.

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How was Mendeleev's periodic table arranged?

• by increasing atomic mass

• by decreasing atomic mass

• by increasing atomic number

• by decreasing atomic number

What is Mendeleev known for?

• creating today's atomic model

• discovering protons

• publishing the first periodic table

• discovering Mendelevium

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