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Unformatted text preview: Water originated from volcanic activity. They produced vapor which eventually formed clouds, and then precipitation. Elements of Life Life made up off about 25 different chemical elements. Carbon, hydrogen, nitrogen and oxygen make up the bulk of things. Atoms consist of protons, neutrons, and electrons. An atom is the smallest particle of an element that retains the elements characteristics. o Protons are positive, neutrons are neutral, and electrons are negative. o Isotopes are elements with the same number of protons, but a different number of neutrons. o Electrons are arranged in shells, which may hold varied numbers of electrons. Atoms whose outer shells are not filled tend to react with other atoms, by losing, gaining or sharing electrons. This forms chemical bonds. o Covalent bonding shares electrons. o Hydrogen bonds are weak, but important....
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- Spring '08