Question

the number of valence electrons of an element with atomic number 15 is​

Answer 1

Answer:

5 is the number of valence electrons of the element with atomic number 15

Answer 2

Let us write down the electronic configuration (e.c) of the element whose atomic number(Z) =15. From this we get to know that there are already 5 electrons in the last/valent shell, hence the number of valence electrons is 5.