atom elements Flashcards
atom
the smallest particle of an element that can exist
element
a pure chemical substance that cannot be physically split into a more simple subsistence. each is made of one type of atom. carbon mercury and hydrogen are examples.
molecule
the smallest particle of a substance that can exist. it is composed of two or more atoms
compound
a substance made of two or more eliments
proton
a particle of matter that has a positive electrical charge and found in the nucleus of an atom
neutron
a particle of matter that has no electrical charge and found in the nucleus of an atom
electron
a particle of matter that has a negitive electical charge and travels around the nucleus of an atom
atomic number
= the number of protons in an elements atoms top number in the element box.
mass number
number of protons plus neutrons. bottom number in the element box.
chemical symbol
a one or two letter representation of an element