Atom and the Periodic Table

The most characteristic property of the noble gases is that they

• have low boiling points.

• are largely unreactive.

• are radioactive.

• are gases at ordinary temperatures.

Which is the best reason that the atomic radius generally increases with atomic number in each group of elements?

• The number of neutrons increases.

• The nuclear charge increases.

• A new octet forms.

• The number of occupied energy levels increases.

A horizontal row of blocks in the periodic table is called a(n)

• octet.

• period.

• group.

• family.

Elements in a group or column in the periodic table can be expected to have similar

• properties.

• atomic masses.

• atomic numbers.

• numbers of neutrons.

Tags

NGSS.HS-PS1-1

What are the radioactive elements with atomic numbers from 90 to 103 called?

• the noble gases

• the lanthanides

• the actinides

• the rare-earth elements

Tags

NGSS.HS-PS1-8

Potassium and bromine belong to

• Period 4.

• Group 4.

• Group 1.

• Period 1.

Tags

NGSS.HS-PS1-1

In a row in the periodic table, as the atomic number increases, the atomic radius generally

• increases.

• remains constant.

• becomes immeasurable.

• decreases.

The atomic number of lithium, the first element in Group 1, is 3. The atomic number of the second element in this group is

• 10.

• 4.

• 11.

• 18.

Tags

NGSS.HS-PS1-1

What are the elements with atomic numbers from 58 to 71 called?

• the actinides

• the alkali metals

• the lanthanides

• the noble gases

One-half the distance between the nuclei of identical atoms that are bonded together is called the

• electron cloud.

• atomic radius.

• atomic diameter.

• atomic volume.