Which of the following principles is the periodic table mainly bases on? (a) It

Question

1. Which of the following principles is the periodic table mainly bases on? (a) It is based on the uncertainty principle (b) All electrons in an atom must have the same set of quantum numbers. (c) No two electrons in an atom can have the same set of quantum numbers.(d) All electrons in an atom are in orbitals having the same energy (e) Energy is conserved in all interactions.
2. Give an example to support your choice in Question 1.
3. Suppose the electron in the hydrogen atom obeyed classical mechanics rather than quantum mechanics. Why should such a hypothetical atom emit a continuous spectrum rather than the observed line spectrum?
4. Describe how the structure of atoms would differ if the Pauli exclusion principle were not valid. What consequences would follow, both at the atomic level and at the world at large.
5. Why do lithium, potassium and sodium exhibit similar chemical properties?

Explanation / Answer

c) thats pauli exclusion principle...

lithium, potassium and sodium exhibit similar chemical propertie because they have 1 e- in outermost shell

quantum mechanics says that energy levels are discrete whereas classcial mechanics doesnt ...so if classcial mechanics were to be true then we would see continuos band rather than obversed..

If the Pauli exclusion principle were not valid, then the building up of the electronic structure of atoms as a succession of quantum states of increasing energy level would not occur. Occupied lower states would not exclude further occupancy. The periodic table of the elements would not exist, because the periodic table depends on the chemical differences produced by differences in ground state electron configuration among the elements.

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