BIO 202 Lecture Notes - Lecture 2: Electron Rest Mass, Partial Charge, Trace Element

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1: an atom cannot be broken down into simper substances by chemical means. The word atom is derived from the greek word atomos, which means indivisible. There are 118 known elements, and 94 occur naturally: molecules and compounds, when atoms are combined in fixed numbers, they are called molecules and compounds, 2 oxygen atoms combine to form a molecule of oxygen, o2. Vicinity of the nucleus, and preserves the atomic structure: atoms overall are neutral: #protons = #electrons, each element has a unique number of protons in the nucleus of its atoms: atomic number = # protons. This identifies the element: mass number = # protons + # neutrons in daltons (amu, number of neutrons can vary, atomic forms of the same element with different number of neutrons are called isotopes. 2: different proportions of elements are found in organisms vs. in the earth, the eleven elements typically most abundant in living organisms are shaded in blue.

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