# The Scientists Dilemma!

Chemistry Level 1

There are two Scientists whose proposed their respective periodic tables based on Aufbau Principle

• Scientist 1 proposed his periodic table by following Aufbau principle.

• Scientist 2 proposed his periodic table by not following Aufbau principle.

True or False ?

$$\text{Potassium} (K - 19)$$ is placed in $$s-block$$ of Scientist 1 periodic table whereas it is placed in $$d-block$$ in Scientist 2 periodic table.

• When one is not following Aufbau principle the electrons get filled in the order : $1s,2s,2p, 3s, 3p, 3d, 4s, 4p, 4d, 4f, etc$
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