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Mg (group 2, valence 2) and N (group 15, valence 3) form Mg₃N₂ by cross-multiplying valences.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Modern Periodic Law and Present Form - Long Form Periodic Table
Ge (group 14, valence 4) forms GeO₂ with oxygen (valence 2), a stable covalent oxide, unlike GeO, Ge₂O, or GeO₄.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Genesis of Periodic Classification - Dobereiner Newlands Mendeleev
Al (group 13, valence 3) and O (group 16, valence 2) form Al₂O₃ by cross-multiplying valences.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Electron Gain Enthalpy and Electronegativity and Valency
Al (group 13, valence 3) and S (group 16, valence 2) form Al₂S₃ by cross-multiplying valences, a stable ionic compound.
Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Anomalous Properties and Second Period and Chemical Reactivity
For 100 g: C = 52.17 g, H = 13.04 g, O = 34.78 g. Moles: C ≈ 4.35, H ≈ 13.04, O ≈ 2.17. Divide by smallest (2.17): C ≈ 2.00, H ≈ 6.00, O = 1.00. Ratio = 2:6:1; empirical formula = C₂H₆O.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Dalton's Atomic Theory and Atomic and Molecular Masses
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