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HPCET Atomic Structure — practice questions — page 3

Explore 101 free Atomic Structure questions in HPCET Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Atomic Structure questions and exercises with answers

Showing questions 61–90 of 101.

Which of the following orbital shapes is dumbbell-shaped along an axis?Read the answer and worked solution →How many *angular* nodes does a $3d$ orbital have?Read the answer and worked solution →The number of *radial* nodes in a $4s$ orbital isRead the answer and worked solution →The ionisation energy of hydrogen in its ground state isRead the answer and worked solution →For $He^+$, the ionisation energy from its ground state isRead the answer and worked solution →Which transition in the hydrogen atom emits the largest amount of energy?Read the answer and worked solution →Which of the following experimental phenomena could **NOT** be explained by classical EM wave theory?Read the answer and worked solution →The Bohr model failed to explainRead the answer and worked solution →In the photoelectric effect, the *stopping potential* $V_0$ varies with the frequency of incident light asRead the answer and worked solution →Which of the following is **NOT** a possible set of quantum numbers for a 3d electron?Read the answer and worked solution →The total number of electrons that can fit in the $M$ shell ($n=3$) isRead the answer and worked solution →The Bohr radius for hydrogen ($n=1, Z=1$) is approximatelyRead the answer and worked solution →The proton was discovered through experiments involvingRead the answer and worked solution →The neutron was discovered byRead the answer and worked solution →In Thomson's atomic model (plum-pudding), the atom isRead the answer and worked solution →The Bohr orbit velocity of the ground-state electron in hydrogen is aboutRead the answer and worked solution →The Rydberg constant for hydrogen, in SI units, isRead the answer and worked solution →Match each scientist to their contributionRead the answer and worked solution →Ionic or covalent?Read the answer and worked solution →Complete the driver of bond formationRead the answer and worked solution →Single, double and triple bondsRead the answer and worked solution →True or false: Lewis structuresRead the answer and worked solution →Complete the definition of resonanceRead the answer and worked solution →Tap every bond parameter the chapter namesRead the answer and worked solution →True or false: ionic solidsRead 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 →Bonded pair or lone pair?Read the answer and worked solution →Flip and pair: term with meaningRead the answer and worked solution →

Worked practice questions

Which of the following orbital shapes is dumbbell-shaped along an axis?

  1. d orbital (in general)
  2. f orbital
  3. p orbital
  4. s orbital
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Correct answer: C. p orbital

p orbitals ($p_x, p_y, p_z$) are dumbbell-shaped along their axis with a node at the nucleus. s is spherical; d (except $d_{z^2}$) is four-lobed cloverleaf.

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How many *angular* nodes does a $3d$ orbital have?

  1. $1$
  2. $2$
  3. $0$
  4. $3$
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Correct answer: B. $2$

Angular nodes = $l$. For d ($l=2$): 2 angular nodes. Total nodes = $n - 1 = 2$; radial nodes = $n - l - 1 = 0$. A 3d orbital has 2 angular nodes and no radial nodes.

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The number of *radial* nodes in a $4s$ orbital is

  1. $4$
  2. $1$
  3. $0$
  4. $3$
Show answer and solution

Correct answer: D. $3$

Radial nodes $= n - l - 1$. **For 4s:** $4 - 0 - 1 = 3$.

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