Biology 1001A Midterm: Chemistry Midterm Notes

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Atomic number: the number of protons (and electrons excluding ions) in an atomic nucleus. Mass number: the total number of protons and neutrons in an atom. Atomic mass: the physical mass of an atom expressed in grams. Isotopes: atoms with the same number of protons but different number of neutrons. Average atomic mass = (cid:3043)(cid:3032)(cid:3045)(cid:3030)(cid:3032)(cid:3041)(cid:3047) (cid:3046)(cid:3042)(cid:3047)(cid:3042)(cid:3043)(cid:3030) (cid:3028)(cid:3029)(cid:3048)(cid:3041)(cid:3031)(cid:3028)(cid:3041)(cid:3030)(cid:3032) x isotopic mass. The atomic mass assigned to each element on the periodic table is the average of all the (cid:2869)(cid:2868)(cid:2868) masses of all the isotopes of that element. Ions: an atom that gains or loses one or more electrons. An atom that loses one or more electrons with have a positive charge equal to the amount of electrons it lost and is called a cation. An atom that gains one or more electrons with have a negative charge equal to the amount of electrons it gained and is called an anion. Molecules: a compound which is made up of different elemental atoms.

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