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Chemistry
Reporting Category 1
Term | Definition |
---|---|
atom | smallest unit of an element |
protons | positively charged particles |
electrons | negatively charged particles |
neutrons | neutral particles |
atomic number | equals the number of protons and electrons |
atomic mass | equals the number of protons and neutrons in the nucleus |
nucleus | the center of the atom that contains the protons and the neutrons |
valence electrons | the number of electrons in the outermost shell |
two | the number of electrons that the innermost energy level can hold |
subscript | the small number written after the chemical symbol that states how many atoms of that element are present |
coefficient | 4CO2 The number four is a _______? |
8 | 4CO2 The total number of oxygen atoms |
12 | 4CO2 The total number of atoms present |
groups | the columns on the periodic table |
periods | the rows on the periodic table |
reactivity | electrons determine an elements ______. |
noble gases | elements in group 18 that have a full outer shell |
metals | shiny, good conductors of heat and electricity |
non-metals | dull and are not good conductors of heat and electricity |
metalloids | along the stairstep on the periodic table, share characteristics of both metals and nonmetals. |
neutral | the overall charge of an atom |