Common Misconceptions

## Structure Of Atom

- Confused? Not any more, understand most confusing terms of the chapter in a very easy method.
1
The maximum number of electrons in a d-orbital is 10
If you see a question that asks you the maximum number of electrons say in a d-orbital, would you say 10?
While answering this, you need to remember that a d-subshell has 5 orbitals and each orbital can hold a maximum of 2 electrons. So, one orbital will always hold a maximum of 2 electrons. But the d-subshell as a whole will hold a maximum of 10 electrons.
Similarly, each orbital in s and p will hold a maximum of 2 electrons only. But the total number of electrons in the s and p subshells will be 2 and 6 respectively.
2
All the lines of the Balmer series belong to the visible region of the electromagnetic spectrum
Our textbook says that, "the Balmer series of lines are the only lines in the hydrogen spectrum which appear in the visible region".
When we read this, we often end up thinking that all the lines of the Balmer series for hydrogen and hydrogen like species would lie in the visible region. But this is not true. In fact, the first line of the Balmer series of ion lies in the ultraviolet region. This results from the fact that we have to consider the atomic number of the species in our calculations.
In order to avoid making a mistake, always use the expression given below to describe the series of lines in hydrogen and hydrogen like species.
3
Atoms have a hard boundary. No.
Pictures of atoms are drawn in a way that gives us a sense that atoms have an edge or a boundary.
In reality, atoms are represented as a fuzzy electron cloud with the nucleus at the center (image below) and do not really have a hard boundary.