Conversion: Angstroms (A) are often used to measure atomic dimensions. Conversion: atomic number: -- the whole number on Periodic Table; determines the identity of an atom mass number: isotopes: different varieties of an element’s atoms -- -- some are radioactive; others aren’t -- An atom of a specific isotope is sometimes called a nuclide. All atoms of an element react the same, chemically. The Periodic Table group: a vertical column; elements in a group share certain phys. and chem. properties -- group 1 = alkali metals -- group 2 = alkaline earth metals -- group 16 = chalcogens -- group 17 = halogens -- group 18 = noble gases Most molecular compounds contain only nonmetals. molecular formula: empirical formula: structural formula: Also... perspective drawing model space-filling model Nomenclature of Binary Molecular Compounds Use Greek prefixes to indicate how many atoms of each element, but don’t use “mono” on first element. 1 mono 3 tri 5 penta 7 hepta 9 nona – – – – – 2 di 4 tetra 6 hexa 8 octa 10 deca – – – – – EXAMPLES: carbon dioxide N2O5
Conversion: Angstroms (A) are often used to measure atomic dimensions. Conversion: atomic number: -- the whole number on Periodic Table; determines the identity of an atom mass number: isotopes: different varieties of an element’s atoms -- -- some are radioactive; others aren’t -- An atom of a specific isotope is sometimes called a nuclide. All atoms of an element react the same, chemically. The Periodic Table group: a vertical column; elements in a group share certain phys. and chem. properties -- group 1 = alkali metals -- group 2 = alkaline earth metals -- group 16 = chalcogens -- group 17 = halogens -- group 18 = noble gases Most molecular compounds contain only nonmetals. molecular formula: empirical formula: structural formula: Also... perspective drawing model space-filling model Nomenclature of Binary Molecular Compounds Use Greek prefixes to indicate how many atoms of each element, but don’t use “mono” on first element. 1 – mono 3 – tri 5 – penta 7 – hepta 9 – nona 2 – di 4 – tetra 6 – hexa 8 – octa 10 – deca EXAMPLES: carbon dioxide N2O5
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