Term | Definition |
Matter | anything that occupies space and has mass |
Mass | the quantity of matter an object has |
Element | substances that cannot be broken down chemically into simpler kinds of matter |
atom | the simplest particle of an element that retains all of the properties of life |
Nucleus | makes up the bulk of the mass of an atom(protrons+neutrons) |
proton | a stable subatomic particle occurring in all atomic nuclei with a positive electric charge |
neutron | a subatomic particle without a charge |
atomic number | number of protons in an element |
mass number | equal to the total number of protons and neutrons |
electron | negatively charged particles |
orbital | three dimensional region around the nucleus that indicates the probable location of an eletron |
isotope | atoms of the same element that have a different number of neutrons |
compound | made up of the atoms of two or more elements in fixed proportions |
chemical bond | the active forces that hold atoms together |
covalent bond | forms when two atoms share one or more pair of electrons |
molecule | simplest part of a substance |
ion | an atom or molecule in witch the number of electrons is not equal to the number of protons |
ionic bond | because positive and negative electric charges attract each other, the sodium ion and the chloride ion attract each other. this attraction is called _________ |