Question

What is the number of valence electrons in an element having atomic number 17 . Name the valence shell of this atom also

Answer 1

7 is the number of valence electron

Answer 2

Hey Pretty Stranger!

In order to find out the number of valence electrons, we should write down the electronic configuration of element X. The atomic number of an element X is 17, so one atom of X contains 17 electrons. The electronic configuration will be

$\sf \: K \: L \: M \\ 2,8,7$

Here M shell is the outermost shell or valence shell of the atom and has 7 electrons in it. Thus, there are 7 valence electrons in the atom of element X