Chemical Bonding

Element

A substance that cannot be broken down into a simpler substance by ordinary chemical changes.

Compound

A substance made up of two or more different types of atoms bonded together

Molecule

A group of atoms that are held together by covalent bonds.

Lewis Dot / Electron Dot Diagram

a model that uses electron-dot structures to show how electrons are arranged in molecules

Chemical Formula

Uses chemical symbols to represent the atoms of the elements and their ratios in a chemical compound

Chemical Bond

An attractive force that holds together the atoms, ions, or groups of atoms in a molecule or compound.

covalent bond

a bond that results from the sharing of valence electrons

ionic bond

the force of attraction between the oppositely charged ions in an ionic compound.

True or false: Atoms are electrically neutral; that is they do not have a charge

True

When electrons cannot be gained or lost, they are

Shared

Electrons have what kind of charge?

Negative

Protons have what kid of charge?

positive

Covalent

A covalent bond is a chemical bond resulting from SHARING of electrons between 2 bonding atoms.

Octet Rule

states that atoms tend to gain, lose, or share electrons so that each atom has full outermost energy level which is typically 8 electrons.

Metallic

A metallic bond occurs between metals. A metal consists of positive ions surrounded by a "sea" of mobile electrons.

Which type of bond is when two or more atoms combine by sharing electrons?

Covalent bond

Which type of bond dissolves in water?

Ionic bond

NaCl is a(n)_____ bond.

ionic

In the compound NaCl, which element contains the positive charge?

sodium

Which type of element forms negative ions

nonmetals

balanced equation

a chemical equation that contains the same number of atoms on both sides of the equation for each element.

reactant

the compounds that exist before a chemical reaction occurs

product

the chemical compounds that exist after a chemical reaction occurs

coefficient

the number in front of a chemical formula that indicates the number of molecules of that compound that are present.

ion

an atom with an electrical charge due to the gaining or losing of electrons