Bio Ch 2 sec 1
Order by
18 terms
Terms | Definitions |
|---|---|
 matter | anything that occupies space and has mass |
| mass | the quantity of matter an object has |
| element | substances that cannot broken down chemically into simpler kinds of matter |
| atom | simplest particle of an elements that retains all of the properties of that element |
| nucleus | central region that makes up the bulk of the mass of the atom and consists of 2 kinds of subatomic particles |
| proton | positively charged |
| atomic number | number of protons in an atom(of the element) |
| mass number | of an atom that is equal to the total number of protons and neutrons of the atom |
| electrons | in an atom the number of positively charged protons is balanced by an equal number of small, negatively charged particles |
| orbital | 3D region around a nucleus that indicates the probable location of an electron |
| compounds | made up of atoms of two o more elements in fixed proportions |
| chemical bonds | the attractive forces that hold atoms together |
| covalent bonds | forms when to atoms share one or more pairs of electrons |
| molecule | simplest part of a substance that retains all of the properties of that substance and can exist in a free state |
| ion | an atom or molecule with an electrical charge |
| ionic bond | because positive and negative electrical charges attract each other, the sodium ion and the chloride ion attract each other |
| isotopes | atoms of the same element that have a different number of neutrons |
| neutron | has no charge |
First Time Here?
Welcome to Quizlet, a fun, free place to study. Try these flashcards, find others to study, or make your own.