CHEMICAL FORMULA ATOMS AND MOLECULES 03 Class 9th Science (Chemistry) (Practice Sheet) 1 What is a charged atom or group of charged atoms called? A. Neutron B. Electron C. Ion D. Proton 2 Which term is used for a positively charged ion? A. Neutron B. Anion C. Cation D. Electron 3 What happens when an atom gains an electron? A. It becomes a cation B. It becomes an anion C. It loses a proton D. It becomes neutral 4 What is the combining capacity of an atom known as? A. Charge B. Atomic mass C. Valency D. Ionization energy 5 In a chemical formula, which element is usually written first? A. Nonmetal B. Metal C. Anion D. Cation 6 What does the chemical formula NaCl represent? 7 How is an ionic bond formed in an ionic compound? 8 What is the unit of molecular mass? 9 What is valency? 10 Define formula unit mass and explain its significance in ionic compounds. Page 1 Email: Phone No: Website:
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