Chem 101 Ch 5

• Made of two or more elements, whole# ratio, formula, 
• H₂O, CH₄, NaCl, C₂H₄O₂, C₆H₁₂O₆

electrons transferred from metal to non-metals, cation(+) and anion(-), electrostatic attraction

• they are compounds that share electrons by non-metals,
• H₂, O₂, H₂O, CH₄, C₃H₈

• compounds form to give atoms 8 electrons, isoelectronic with noble gas, Lewis dot,
• Group 1A lose 1 e-, M⁺, cations,
• 2A lose 2 e-, M²⁺
• 3A lose 3 e-, M³⁺
• 7A (halogens) gain 1 e-, X^-, anions,
• 6A gain 2 e-, X^2-

M⁺ cations get smaller, X-anions get larger ionic radius

M⁺X^-, electrostatic opposite charges, salt, hard, crystalline, high mp, crystal pattern, MxAy, ratio, total charge 0, balanced, MgC_l2, Na₂S, name: metal nonmetalide, halide, oxide, nitride, Al₂O₃, variable charge metals, Fe, 2+ or 3+, Cu, 1+ or 2+, use I, II, or III in names.