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Writing Chemical Formulas

Writing Chemical Formulas. The symbol for each different element begins with a CAPITAL letter. (If a second letter is part of the symbol it is small case C a SO 4 Positive ions are always placed first in a chemical formula. Cl - , Rb + Rb Cl.

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Writing Chemical Formulas

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  1. Writing Chemical Formulas

  2. The symbol for each different element begins with a CAPITAL letter. (If a second letter is part of the symbol it is smallcase CaSO4 • Positive ions are always placed first in a chemical formula. • Cl-, Rb+ RbCl

  3. The sum of the valence numbers must add to zero • Al+3, O-2 Al2O3 • [2 x (+3)] + [3 x (-2)] = • +6 + -6 = 0

  4. Never write the number one (1) in a chemical formula. Na1Br1 NaBr

  5. Reduce subscripts to lowest terms. Be4F8 becomes BeF2 • This produces an empirical formula or a simple formula

  6. If a polyatomic ion (radical) requires a subscript, parentheses are placed around the polyatomic ion and the subscript is placed outside the parentheses. Pb+4, SO42- Pb(SO4)2

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