chemistry (1.2)

Each column in the periodic table is

• An element

• A group

• A period

• A row

What does a period in the periodic table represent?

• The first element

• The first column

• A column

• A row

Elements that are solid at room temperature and good conductors of heat and electricity are called

• Halogens

• Nobel gases

• Nonmetals

• Metals

An atom with a full set of valence electrons is

• Solid

• Stable

• Unstable

• Reactive

Which of the following is true about metalloids?

• They are called nonmetals

• They are malleable

• They are on the left of the periodic table

• They have properties of both metals and nonmetals

Which of the following elements are placed below the rest of the periodic table?

• Halogens

• Nobel gases

• Alkali metals

• Lanthanides

The atomic number of aluminum is 13 and its mass number is 27. It has

• 13 protons , 13 electrons , 14 neutrons

• 14 protons , 14 electrons , 27 neutrons

• 27 protons , 13 electrons , 14 neutrons

• 13 protons , 13 electrons , 13 neutrons

Sodium, with atomic number 11, loses one electron to become stable.

To which family does the element sodium belong?

• Actinides

• Halogens

• Noble gases

• Alkali metals

Chlorine is an element that belongs to the halogen group. It has 17 protons and 18 neutrons.

What is the mass number of chlorine ?

• 17

• 18

• 35

• 17

Chlorine is an element that belongs to the halogen group. It has 17 protons and 18 neutrons.

How many electrons does chlorine have ?

• 17

• 18

• 27

• 35