Choose atom that having spin quantum number ½
Correct answer: B. 15N
- A. 12C
- B. 15N
- C. 16O
- D. 32S
Explanation
The spin is a quality of particles, it tells us the angular momentum (½) of an electron of a substance. Since momentum is a vector quantity, the spin quantum number can be both positive and negative. This question asks which atom has a ½ spin number, the positive and negative spins of atoms with an even number of electrons will cancel out, thus only an atom with an odd number of electrons has a spin of ½ which is B.
This question appeared on the ETEA MDCAT 2015 paper, which you can sit online with every answer explained.
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About Quantum Numbers
Quantum numbers describe an electron's energy level, subshell, orbital orientation and spin. You examine the principal, azimuthal, magnetic and spin quantum numbers, their allowed values, orbital capacity and how they determine electronic configurations and distinguish electrons within an atom.
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