| A | B |
|---|
| atom | the smallest particle of an element that retains the properties of that element is the |
| atomic mass | mass of the element usually in decimal form on the periodic table |
| atomic number | the number of protons in the nucleus of an atom |
| chemical formula | ex. NaOH, NaCl, KNO3 |
| electron | a negatively charged particle that circles the nucleus of an atom |
| family | a group of elements with similar chemical properties- not neccissarily in vertical columns |
| group | vertical columns on the periodic table made up of elements with similar chemical properties |
| metalloids | elements that have properties of metals and nonmetals |
| metals | groups of elements that have luster, are good conductors of heat and electricity, and have one to three electrons in their outermost shell |
| neutron | a particle of the atom that has no electric charge |
| nonmetals | dull substances that don't conduct electricity found on the right side of the periodic table |
| nucleus | center of the atom that contains protons and neutrons |
| period | horizontal rows of elements on the periodic table arranged in increasing atomic number |
| proton | a positively charged particle in the nucleus of an atom |
| shell | energy level or electron cloud- region outside the nucleus where electrons are found |
| subscript | a small lowered number that shows the proportion atoms of an element in a molecule |
| symbol | a letter or group of letters representing an element, atom or molecule |
