Chemistry Semester 1 Part 3

Front

What are valence electrons?

Back

Valence electrons are the electrons in the outermost shell of an atom that are involved in forming bonds with other atoms.

Front

How many valence electrons does a silicon atom have?

Back

A silicon atom has 4 valence electrons.

Front

How many valence electrons are in a phosphorus atom?

Back

A phosphorus atom has 5 valence electrons.

Front

What is an ionic compound?

Back

An ionic compound is a chemical compound composed of ions held together by ionic bonds.

Front

What is the octet rule?

Back

The octet rule states that atoms tend to gain, lose, or share electrons to achieve a full outer shell of 8 electrons.

Front

How many electrons does sodium need to lose to obey the octet rule?

Back

Sodium needs to lose 1 electron to obey the octet rule.

Front

What is the formula for calcium iodide?

Back

The formula for calcium iodide is CaI2.

Front

How many iodine atoms are needed to form calcium iodide from one calcium atom?

Back

Two iodine atoms are needed to form calcium iodide from one calcium atom.

Front

What are cations and anions?

Back

Cations are positively charged ions, while anions are negatively charged ions.

Front

What is the significance of ionic bonds in compounds?

Back

Ionic bonds are significant because they hold together the oppositely charged ions in ionic compounds.