Which of the following pairs of elements have same number of electrons in their outermost shell?

Which of the following pair of elements have same number of electron in their outermost shell (1)Na ,Sr (2) Se , Te (3)Mn , Fe (4) As, Bi

Which of the following pairs of atoms have same number of electrons in the outermost orbit

Which of the following pairs has elements containing same number of electrons in the outermost orbit?

Which of the following pairs has elements containing same number of electrons in the outermost orbit

Two elements having a single electron in their outermost shell

Name two elements that have two electrons in their outermost shells