Anatomy Ch. 2 The Chemical Basis of Life

anything that occupies space and has mass

matter

the amount of matter in an object

mass

the gravitational force acting on an object of a given mass

weight

the simplest type of matter with unique chemical properties; composed of atoms of only one kind

element

smallest particle of an element that has chemical characteristics of that element

atom

what is contained in the atomic structure

atoms (protons, neutrons, and electrons)

nucleus

electron cloud

have no electrical charge

neutrons

contain one positive charge

protons

contain one negative charge

electrons

formed by protons and neutrons

nucleus

most of the volume of an atom is occupied by ______

electrons (electron cloud)

equal to number of protons in each atom, which is equal to the number of electrons

atomic number

number of protons plus number of neutrons

mass number

two or more forms of same element with same number of protons and electrons but different neutron number

isotopes

average mass of naturally occuring isotopes

atomic mass (weight)