What is the principal quantum number for second period?a)1b)3c)2d)4Correct answer is option 'C'. Can you explain this answer?

Question

Answer

Principle quantum no is defined as the no of shells an element possesses. Since every element in the 2nd period has 2 shells, therefore, principle quantum no for 2nd period is 2.

Answer

Principle quantum no is defined as the no of shells an element possess.since every element in 2nd period has 2 shells therefore  principle quantum no for 2nd period is 2

Answer

Because the energy lvl is 2

Answer

Understanding Principal Quantum Number
The principal quantum number (n) indicates the energy level of an electron in an atom and determines the size of the electron cloud. Here's a detailed explanation of how it relates to the second period of the periodic table.
Principal Quantum Number for the Second Period
- The second period consists of the elements from lithium (Li) to neon (Ne).
- In this period, the principal quantum number is 2.
Identifying the Elements
- The elements in the second period are:
- Lithium (Li)
- Beryllium (Be)
- Boron (B)
- Carbon (C)
- Nitrogen (N)
- Oxygen (O)
- Fluorine (F)
- Neon (Ne)
- All these elements have their electrons filling the 2s and 2p orbitals.
Energy Levels and Electron Configuration
- The principal quantum number n=2 indicates that the electrons are in the second energy level.
- The electron configurations for these elements start from 1s and move to 2s and then 2p.
Conclusion
In summary, the principal quantum number for the second period is 2. This number signifies the energy level where the electrons of these elements reside, confirming your answer as option 'C'. Understanding this concept is essential for grasping the basics of atomic structure in chemistry.

Answer

Refer to a modern periodic table

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