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DSSSB TGT Class9 Atom Structure — practice questions

Explore 26 free Class9 Atom Structure questions in DSSSB TGT Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Class9 Atom Structure questions and exercises with answers

Showing questions 1–26 of 26.

Order the atomic models as they were proposedRead the answer and worked solution →Match each scientist to their modelRead the answer and worked solution →Match each model to what it could NOT explainRead the answer and worked solution →True or false: Rutherford's modelRead the answer and worked solution →True or false: Bohr's modelRead the answer and worked solution →Complete the reason Bohr's model failsRead the answer and worked solution →Which model does this belong to?Read the answer and worked solution →Match each quantum number to what it is calledRead the answer and worked solution →True or false: the quantum mechanical modelRead the answer and worked solution →Order the structure: from atom down to electronRead the answer and worked solution →Complete the (n + l) ruleRead the answer and worked solution →True or false: orbital energiesRead the answer and worked solution →Match each rule to what it forbids or requiresRead the answer and worked solution →Tap every statement Hund's rule requiresRead the answer and worked solution →The fundamental particlesRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Which principle is being described?Read the answer and worked solution →Flip and pair: symbol with meaningRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Tap every statement true of the Schrodinger modelRead the answer and worked solution →Reading the models backRead the answer and worked solution →Assertion and reason: filling orbitalsRead the answer and worked solution →True or false: shells and subshellsRead the answer and worked solution →Complete the two filling rulesRead the answer and worked solution →

Worked practice questions

Order the atomic models as they were proposed

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Steps
  1. Dalton: the atom is the ultimate indivisible particle
  2. Thomson: a sphere of positive charge with electrons embedded
  3. Rutherford: a tiny dense nucleus with electrons revolving around it
  4. Bohr: electrons in fixed circular orbits of definite energy
  5. Schrodinger: a wave equation giving energy states and orbitals
syllabus walks through them in this order, each answering what the previous one could not: Dalton 1808, Thomson 1898, Rutherford 1909, Bohr 1913, Schrodinger 1926. Source: syllabus Chemistry Part I, Ch 2 Structure of Atom.

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Match each scientist to their model

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Matching pairs
  1. Left
    Dalton
    Right
    atom as the ultimate indivisible particle
  2. Left
    Thomson
    Right
    electrons embedded in a sphere of positive charge
  3. Left
    Rutherford
    Right
    a tiny positively charged nucleus at the centre
  4. Left
    Bohr
    Right
    electrons confined to certain circular orbits
  5. Left
    Schrodinger
    Right
    a wave equation for electron distribution
Five models, five names. Source: syllabus Chemistry Part I, Ch 2 Structure of Atom.

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Match each model to what it could NOT explain

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Matching pairs
  1. Left
    Thomson's model
    Right
    disproved by alpha-particle scattering
  2. Left
    Rutherford's model
    Right
    could not explain the atom's stability
  3. Left
    Bohr's model
    Right
    failed for multi-electron atoms
  4. Left
    Bohr's model again
    Right
    ignored the electron's wave nature
The failures are what drove the next model, and they are the examinable part. Source: syllabus Chemistry Part I, Ch 2 Structure of Atom.

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