Introductory+Material+Part+2

Introductory+Material+Part+2 - 1 Introductory Material Part...

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Introductory Material Part 2 Covalent Compounds – Form when elements share electrons which usually occurs between nonmetals . In a hydrogen molecule (H 2 ) a pair of electrons (one from each individual H atom are shared between the two nuclei. Molecule is the term used to describe covalent compounds. Other diatomic molecules: O 2 N 2 all halogens (F 2 etc.) Atoms of different elements may also share electrons to form molecules of a covalent compound. HCl, H 2 O, FCl – This will be discussed more in Ch. 9 Most covalent substances consist of molecules. NO molecules exist in a sample of ionic compounds – only ions present which implies complete transfer of electron(s) from a metal to a nonmetal . Eg. NaCl, MgO Polyatomic Ions – Covalent bonds within Ions CaCO 3 Calcium Carbonate is an ionic compound, but covalent C – O bonds exist within the carbonate ion, CO 3 2 . The other ion is Ca 2+ . Chemical Vocabulary – Formulas, Names and Masses – The Language of Chemists Chemical Formulas – Types 1.
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