11 terms

Science section 2.1 matter

A substance that cannot be broken down into simplier substances by chemical and physical means
Atomic number
number of protons in the atom's nucleus.
energy level
Reagons that electrons are located in
atoms with the same of protons but different6 of nuetrons
mass number
...total mass protons + neutrons
...a substance that is consists of two or more elements that are chemicaly combined.
chemical bond
Forces that hold atoms together...
an atom that has am electrical charge bc of a gain or loss of one or more electrons.
ionic bond
an atom that gains electrons become negativly charged.
covalent bond
when atoms shere electrons
metallic bond
electrons ar eshared by metal and ions