Chapter 5 The Periodic Table

The order of the 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.

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.

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

• atomic masses.

• propeties

• atomic number.

• symbols.

Magnesium (Mg) is located to the right 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.

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 is known for?

• creating today's atomic model

• discovering protons

• publishing the first periodic table

• discovering Mendelevium

Mendeleev left gaps in his periodic table because

• the table was too small.

• protons belonged there.

• the table was too full.

• no known elements fit there.

Each column of the periodic table is

• an element.

• a group.

• an isotope.

• a period.

The periodic law states that elements that have similar properties appear

• to the left of each other.

• to the right of each other.

• at every tenth element.

• at regular intervals.