Which of the following arrangements represents the correct order of electronic energy level?
The element with electron configuration 1s\(^2\) 2s\(^2\) 2p\(^6\) 3s\(^2\) 3p\(^1\) belongs to
In the periodic table all elements within the same group have the same
Which of the following halogens is liquid at room temperature?
Rare gases are stable because they
