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Structure of Atom
According to Aufbau principle, electrons first occupy the lowest-energy orbital available to them and enter into higher energy orbitals only after the lower energy orbitals are filled.
As 4s orbital has lower (n + l) value, it has lower energy and will be filled first.
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What is an Electron?
What is a proton?
Who discovered neutron?
What is the name of the remaining part of atom except outer orbit?
Name the particles which determine the mass of an element.
What are α-particles?
What are the fundamental particles present in a neutral atom having atomic number greater than 1?
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