valence electrons, Lewis dot structures and oxidation number

Front

What are valence electrons?

Back

Valence electrons are the electrons that are farthest away from the nucleus of an atom. They are involved in chemical bonding and determine the reactivity of the element.

Front

What happens when a sodium atom loses an electron?

Back

When a sodium atom loses an electron, it becomes positively charged.

Front

How many valence electrons does oxygen have?

Back

Oxygen has 6 valence electrons.

Front

How many more valence electrons does oxygen need to be stable?

Back

Oxygen needs 2 more valence electrons to achieve a stable configuration.

Front

What is a Lewis dot structure?

Back

A Lewis dot structure is a diagram that shows the bonding between atoms of a molecule and the lone pairs of electrons that may exist in the molecule.

Front

Which element has a full valence shell?

Back

Neon has a full valence shell.

Front

What is the oxidation number of sodium in NaCl?

Back

The oxidation number of sodium in NaCl is +1.

Front

What is the oxidation number of oxygen in H2O?

Back

The oxidation number of oxygen in H2O is -2.

Front

What is the significance of a full valence shell?

Back

A full valence shell indicates that an atom is stable and less likely to react with other atoms.

Front

How do you determine the oxidation number of an element?

Back

The oxidation number can be determined by the number of electrons an atom gains, loses, or shares when it forms chemical bonds.