Question 1

The order of elements in the periodic table is based on

Accepted Answer

the number of protons in the nucleus.

Answer

the number of electrons in the nucleus.

Answer

the number of neutrons in the nucleus.

Answer

atomic mass.

Question 2

Which of the following elements is an alkali metal?

Accepted Answer

sodium

Answer

aluminum

Answer

calcium

Answer

mercury

Question 3

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

Accepted Answer

on the right side

Answer

on the left-most side

Answer

in the bottom rows.

Answer

in the middle column of the periodic table

Question 4

In Mendeleev's periodic table, the elements were arranged in order of

Accepted Answer

increasing atomic mass.

Answer

increasing number of electrons

Answer

increasing atomic number

Answer

alphabetical order

Question 5

Mendeleev left gaps in his periodic table because

Accepted Answer

no known elements fit there

Answer

the table was too small

Answer

protons belonged there

Answer

the table was too full

Question 6

Each column of the periodic table is

Accepted Answer

a group or family

Answer

an element.

Answer

an isotope.

Answer

a period.

Question 7

Which of the following elements would behave similarly to potassium (K)?

Accepted Answer

Sodium (Na)

Answer

Aluminum (Al)

Answer

Chlorine (Cl)

Answer

Strontium (Sr)

Question 8

Most nonmetals are

Accepted Answer

poor conductors of heat and electricity

Answer

solids at room temperature

Answer

ductile

Answer

shiny

Question 9

Which statement about alkali metals is correct?

Accepted Answer

They are extremely reactive in water.

Answer

They are located in group 2 (2A) of the periodic table.

Answer

They are hard and brittle.

Answer

They are usually gases.

Question 10

Which statement about the noble gases is correct?

Accepted Answer

They are highly unreactive.

Answer

They form compounds with very bright colors.

Answer

They exist as diatomic molecules.

Answer

They are extremely rare in nature.

Question 11

Which of the following elements is a metalloid (semiconductor)?

Accepted Answer

Silicon

Answer

sulfur

Answer

copper

Answer

sodium

Question 12

Metals tend to be

Accepted Answer

good conductors of heat.

Answer

brittle.

Answer

gases at room temperature

Answer

dull.

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