An atom of an element X gains two electrons. The symbol of the ion formed is
Which of the following statements is correct?
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
