Multiple Choice Question Answer VI — task. Science CBSE, Class 9.

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1. Which of the following electronic configuration does not obey aufbau principle -

\(2s^2\), \(2p^4\)
\(2s^1\), \(2p^3\)
\(2s^1\), \(2p^4\)
\(2s^2\), \(2p^5\)

2. The atomic number of an element is always equal to

Electrical charge of the nucleus
Nucleus weight
Atomic weight divided by one
Number of neutron in nucleus

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