Models (Thomson/Rutherford/Bohr), valence, isotopes, ionsPractice Questions & MCQs
Practice Models (Thomson/Rutherford/Bohr), valence, isotopes, ions questions from Structure of the Atom (Class 9 Science) - important MCQs with answers and step-by-step solutions. Solve the sample questions below, then practice the full set free on the RankByte app.
Models (Thomson/Rutherford/Bohr), valence, isotopes, ionsQuiz - Solve & Score
Q1. An atom 'X' has the configuration 2, 8, 6. What is its likely place in the periodic table?
- A.Group 16 (oxygen family), Period 3
- B.Group 6, Period 3
- C.Group 14, Period 3
- D.Group 16, Period 2
Answer: A. Group 16 (oxygen family), Period 3
Which principle settles this? Three shells → Period 3. Six valence electrons → Group 16 (chalcogens). The atom is sulphur. Pick: A) Group 16 (oxygen family), Period 3.
Q2. Which of the following statements is true about a sodium ion (Na+, Z = 11)?
- A.It has 11 protons and 10 electrons
- B.It has 10 protons and 10 electrons
- C.It has 11 protons and 11 electrons
- D.It has 12 protons and 10 electrons
Answer: A. It has 11 protons and 10 electrons
Given 11, asked for the unknown. By Na+ has lost 1 electron: protons = 11, electrons = 10. Na+ has lost 1 electron: protons = 11, electrons = 10. Atomic number Z does not change on ionisation. Hence option A) It has 11 protons and 10 electrons.
Q3. Which of the following correctly describes Thomson's model of the atom?
- A.Electrons are embedded in a positively charged sphere like seeds in a watermelon
- B.Electrons revolve around a small dense nucleus in fixed orbits
- C.Electrons move in waves around the nucleus
- D.All mass is concentrated at the centre and electrons fly around randomly
Answer: A. Electrons are embedded in a positively charged sphere like seeds in a watermelon
That leaves only option A). Confirm with the chapter rule: Thomson visualised the atom as a uniform sphere of positive charge with negatively charged electrons embedded in it - sometimes called the 'plum-pudding' model (chemistry, chapter 'Structure of the Atom'). Answer: A) Electrons are embedded in a positively charged sphere like seeds in a watermelon.
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