HUBS1406 Lecture Notes - Lecture 1: Electron Shell, Hydrogen Atom, Integumentary System
12 Oct 2018
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Reproductive (male) & (female) [not essential for life, only for maintaining the species] Each element is made of a unique substance, composed of atoms. Cannot be broken down into simpler substances. 92 occur naturally on earth; cannot be made, was created cosmically. When the outer orbit of an atom is complete, the atom is stable and unreactive, when the outer orbit of. The atomic number of an element is the number of protos each of its atoms contains. Negative (-1) an atom is incomplete, the atom is unstable and reactive. How to get an atom stable: (method 1) Hand over your spare electrons to another atom. Get the electrons you need to fill your shell from another atom. Atoms that lose electrons become cations- possess a net positive charge. Atoms that gain electrons become anions- possess a net negative charge. Electrical attraction between cations and anions= ionic bonds. bond). Two or more atoms joined via a covalent bond.
