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Biology Chap.2.1

Basic terms for Honors Biology, Grade 9

Anything that occupies space and has mass Matter
The quantity of matter an object has Mass
Substances that cannot be broken down chemically into simpler kinds of matter Element
The simplest particle of an element that retains all of the properties of that element Atom
The central region of an atom that makes up the bulk of an atom and consists of two kinds of subatomic particles, protons and neutrons Nucleus
A positively charged subatomic particle Proton
A subatomic particle with no charge Neutron
The number of total protons of a single atom from an element Atomic Number
The number equal to the total number of protons and neutrons of an atom Mass Number
Negatively charged particles in an atom Electron
A three-dimensions; region around a nucleus that indicates the probable location of an electron Orbital
Atoms of the same element that have a different number of neutrons Isotope
When two or more atoms from different elements combine together in fixed porportions Compound
Attractive forces that hold atoms together Chemical Bond
A bond that forms when two atoms share one or more pairs of electrons Covalent Bond
The simplest part of a substance that retains all of the properties of that substance and can exist in a free state Molecule
An atom or molecule with an electrical charge Ion
The attraction between positive and negative electrical charges that cause them to bond Ionic Bond
Created by: EmilyEdwards