Tamil Nadu Board of Secondary EducationHSC Science Class 11

# An atom of an element contains 35 electrons and 45 neutrons. Deduce the number of protons the electronic configuration for the element All the four quantum numbers for the last electron - Chemistry

An atom of an element contains 35 electrons and 45 neutrons. Deduce

1. the number of protons
2. the electronic configuration for the element
3. All the four quantum numbers for the last electron

#### Solution

An element X contains 35 electrons, 45 neutrons

1. The number of protons must be equal to the number of electrons. So the number of protons = 35.
2. Number of electrons = 35. So the electronic configuration is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5.
3. The last electron i.e. 5th electron in 4p orbital has the following quantum numbers. n = 4, l = 1, m = +1, s = +1/2
Concept: Filling of Orbitals
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Chapter 2: Quantum Mechanical Model of Atom - Evaluation [Page 65]

#### APPEARS IN

Tamil Nadu Board Samacheer Kalvi Class 11th Chemistry Volume 1 and 2 Answers Guide
Chapter 2 Quantum Mechanical Model of Atom
Evaluation | Q II. 16. | Page 65
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