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CDS Atoms and Elements — practice questions

Explore 32 free Atoms and Elements questions in CDS Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Atoms and Elements questions and exercises with answers

Showing questions 1–30 of 32.

NEET · Chemistry · Quantum NumbersRead the answer and worked solution →Mark the sub-atomic boardRead the answer and worked solution →Match the finder to the findingRead the answer and worked solution →Fill the subshells in orderRead the answer and worked solution →Catch what Bohr could not explainRead the answer and worked solution →Complete the n = 3 shellRead the answer and worked solution →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 →

Worked practice questions

NEET · Chemistry · Quantum Numbers

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Matching pairs
  1. Left
    Principal (n)
    Right
    Shell number; energy and size
  2. Left
    Azimuthal (l)
    Right
    Sub-shell shape (0=s, 1=p, …)
  3. Left
    Magnetic (m_l)
    Right
    Orientation of orbital in space
  4. Left
    Spin (m_s)
    Right
    +½ or −½ (electron spin)
  5. Left
    Pauli's exclusion
    Right
    No two electrons share all 4
  6. Left
    Hund's rule
    Right
    Half-fill before pairing
Instructions
Match each quantum-number concept to its meaning.

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Mark the sub-atomic board

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Clues and terms
  1. Clue
    Negative particle in cathode rays whose charge to mass ratio Thomson measured
    Item
    Electron
  2. Clue
    Lightest positive ion, first got from hydrogen, and its count sets the atomic number
    Item
    Proton
  3. Clue
    Neutral particle Chadwick knocked out of beryllium with alpha particles
    Item
    Neutron
  4. Clue
    Tiny central region holding the positive charge and nearly all of the mass
    Item
    Nucleus
  5. Clue
    Atoms of one element that differ only in how many neutrons they carry
    Item
    Isotopes
  6. Clue
    Atoms that share a mass number while their atomic numbers differ
    Item
    Isobars
  7. Clue
    Collective name for the protons and neutrons packed into the core
    Item
    Nucleons
  8. Clue
    Sum of the proton count and the neutron count of one atom
    Item
    Mass number
  9. Clue
    Helium nucleus carrying two positive charges and four units of atomic mass
    Item
    Alpha particle
Instructions
Read each clue and tap the one cell it names, aiming for a line of three.
_Source: syllabus Chemistry Part 1, Ch 2 Structure of Atom_

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Match the finder to the finding

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Matching pairs
  1. Left
    Chadwick
    Right
    Found the neutron by hitting beryllium
  2. Left
    J.J. Thomson
    Right
    Measured the electron charge to mass ratio
  3. Left
    R.A. Millikan
    Right
    Fixed the electron charge by oil drops
  4. Left
    Rutherford
    Right
    Found the nucleus by alpha ray scattering
  5. Left
    Max Planck
    Right
    Named the quantum of radiated energy
  6. Left
    Louis de Broglie
    Right
    Gave moving matter a wavelength
  7. Left
    Wolfgang Pauli
    Right
    Banned two electrons sharing four numbers
  8. Left
    Niels Bohr
    Right
    Placed the electron in fixed energy orbits
Instructions
Tap a name, then tap the discovery it belongs to.
_Source: syllabus Chemistry Part 1, Ch 2 Structure of Atom_

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