Write the electronic configuration ofchromium. (Atomic No. of Cr = 24)

Sure, I can help you with that. The atomic number of chromium (Cr) is 24. To write its electronic configuration, we need to follow the Aufbau principle, which states that electrons fill the lowest energy levels first.

1. Start by filling the 1s orbital with 2 electrons.
2. Move on to the 2s orbital and fill it with 2 electrons.
3. Next, fill the 2p orbital with 6 electrons.
4. Now, move to the 3s orbital and fill it with 2 electrons.
5. After that, fill the 3p orbital with 6 electrons.
6. Now, we come to the 4s orbital. Normally, we would fill it with 2 electrons, but in the case of chromium, one electron from the 4s orbital moves to the 3d orbital to achieve a more stable configuration. So, the 4s orbital has only 1 electron.
7. Finally, fill the 3d orbital with the remaining 5 electrons.

Putting it all together, the electronic configuration of chromium (Cr) is: 1s2 2s2 2p6 3s2 3p6 4s1 3d5.