AP Biology Chapter 2-4 Vocabulary

anything that takes up space

substance that cannot be decomposed into simpler substances by chemical means, and is made up of atoms all with identical number of protons.

A material made up of two or more parts or elements.

any of various chemical elements, such as iron, manganese, zinc, copper, and iodine, that occur in very small amounts in organisms and are essential for many physiological and biochemical processes.

The smallest possible unit of an element that still has all the chemical properties of that element.

subatomic particle with a positive electric charge.

a stable atomic particle that has a negative charge

An elementary atomic particle that has no charge and a mass that is approximately the same as that of a proton

One of several nuclides having the same number of protons in their nuclei and hence having the same atomic number, but differing in the number of neutrons and therefore, in the mass number.

The number of protons in the nucleus of an atom

total number of protons and neutrons in is nucleus

Any rearrangement of electrons in two atoms that generates a force, causing the atoms to be bound to each other, forming a molecule.

A chemical bond formed by the sharing of one or more electrons, especially pairs of electrons, between atoms

a type of bond that occurs when two atoms share a pair of electrons with each other

a type of chemical bond where a pair of electrons is unequally shared between two atoms.