For an electron in K-shell, the correct four quantum numbers are represented by;
Correct answer: C. n = 1, l = 0, m = 0, s = +1/2
- A. n = 2, l = 0, m = 0, s = +1/2
- B. n = 1, l = 1, m = 0, s = -1/2
- C. n = 1, l = 0, m = 0, s = +1/2
- D. n = 1, l = 0, m = 1, s = +1/2
Explanation
The correct four quantum numbers for an electron in the K-shell are:Principal quantum number (n) = 1, which defines the energy level.Azimuthal quantum number (l) = 0, indicating an s orbital.Magnetic quantum number (m) = 0, because an s orbital has no orientation.Spin quantum number (s) = +1/2 or -1/2, representing the two possible spin states of the electron.The principal quantum number (n) for the K-shell is always 1, setting the energy level and proximity to the nucleus. The azimuthal quantum number (l) for an s orbital is 0, determining its spherical shape. The magnetic quantum number (m) is also 0, as there is no spatial orientation for an s orbital. Finally, the spin quantum number (s) can be either +1/2 or -1/2, reflecting the electron's spin direction.Option A is incorrect due to the wrong principal quantum number (n = 2). Option B is incorrect because of the wrong azimuthal quantum number (l = 1). Option D is incorrect due to an incorrect magnetic quantum number (m = 1).
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Atomic Structure
Atomic structure covers the discovery of the proton, Planck's quantum theory, hydrogen emission spectra and the evidence for quantized energy levels. You will use quantum numbers to describe orbitals, distinguish s, p, d and f orbital shapes, and write electronic configurations, including the correct order of electron filling.
Practise Atomic Structure
922 free Atomic Structure MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Atomic Structure questions
For sets of values of quantum numbers (n, l, m and s) are given below. Which of these does not provide a permissible solution of the wave equation?
An electron is allowed to move freely in a closed cubic box of length 10 cm. The minimum uncertainty in its velocity will be observed as:
The value of Planck's constant 'h' is _.
The angular momentum of an e- can be:
Choose the correct option
Choose the correct one.