Tuesday Review: Metallic, Ionic, Covalent

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 Calcium (Ca) have?

Back

Calcium (Ca) has 2 valence electrons.

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.

Front

What is the correct Lewis Dot Structure for Ammonia (NH3)?

Back

The Lewis Dot Structure for NH3 shows nitrogen in the center with three hydrogen atoms bonded to it and one lone pair of electrons on nitrogen.

Front

What is the shape of a molecule with a bent geometry?

Back

A bent geometry occurs when there are unshared pairs of electrons on the central atom, causing the bonded atoms to be pushed closer together.

Front

What is the formal charge of an atom?

Back

The formal charge is the charge assigned to an atom in a molecule, calculated by the number of valence electrons minus the number of non-bonding electrons and half the number of bonding electrons.

Front

What are the formal charges on Boron (B) and Nitrogen (N) in BF3 and NH3 respectively?

Back

The formal charges on Boron in BF3 and Nitrogen in NH3 are both 0.

Front

What is the difference between ionic and covalent bonds?

Back

Ionic bonds involve the transfer of electrons from one atom to another, while covalent bonds involve the sharing of electrons between atoms.

Front

What is a metallic bond?

Back

A metallic bond is a type of chemical bond that occurs between metal atoms, characterized by a 'sea of electrons' that are free to move around.

Front

What is the shape of a molecule with a trigonal planar geometry?

Back

Trigonal planar geometry has three atoms bonded to a central atom, all in the same plane, with 120-degree angles between them.