Chemical Bonding Test

How many valence electrons are in an atom of phosphorus?

• 2
• 3
• 4
• 5

How many valence electrons are in an atom of magnesium?

• b.
• 3
• d.
• 5

How many valence electrons does a helium atom have?

• 2
• 3
• 4
• 5

How many valence electrons are in a silicon atom?

• 2
• 4
• 6
• 8

What is the name given to the electrons in the highest occupied energy level of an atom?

• orbital electrons
• valence electrons
• anions
• cations

How does calcium obey the octet rule when reacting to form compounds?

• It gains electrons.
• It gives up electrons.
• It does not change its number of electrons.
• Calcium does not obey the octet rule.

Which of the following elements forms an ion with a 1– charge?

• fluorine
• hydrogen
• potassium
• sodium

How many electrons does nitrogen gain in order to achieve a noble-gas electron configuration?

• 1
• 2
• 3
• 4

Which of the following occurs in an ionic bond?

• Oppositely charged ions attract.
• Two atoms share two electrons.
• Two atoms share more than two electrons.
• Like-charged ions attract.

Which of the following is true about an ionic compound?

• The chemical formula shows the atoms in a molecule.
• The formula unit gives the number of each type of ions in a crystal.
• It is composed of anions and cations and yet it is electrically neutral.
• The chemical formula shows the ions in a molecule.