Biology 120 Notes (Part 2) Continuing the Discussion of Atoms and Other Molecules

Salts

________ are sold substances that usually sperate and exist as individual ions in water.

Electronegatives

________ describe the strength with which atoms pull electrons toward themselves.

Electrons

________ are not always shared equally.

hydrogen bond

A(n) ________ is a weak attraction between a slightly positive hydrogen atom and a slightly negative tom in another molecule.

Molecules

________ are atoms held together by chemical bonds.

Covalent bonds

________ are a type of bond that describes how electrons are shared.

octet rule

The ________ is a rule describing how a valence shell can only hold eight electrons (unless the atomic number is two or less .)

ionic bind

A(n) ________ forms when electrons are transferred from one atom to another.

ion

A(n) ________ is a charged atom.

Electrons

________ are attracted to the nucleus; it takes energy to hold ________ in place.

Covalent bonds

________ can either be polar or nonpolar.

Electrons

________ determine chemical behavior of atoms.

There are three types of covalent bonds which are called

ionic, covalent, and hydrogen

valence shell

The __________is the outermost energy shell.

Isotopes

__________ deal with neutrons in the atom.