Question

an element X has the mass number 26 and contains 13 neutrons what is the valency of x
wrong answer reported ​

Answer 1

Answer:

Explanation:

1) The element with mass number 27 is  Aluminium. Symbol is Al.  

2a) Given that Aluminium as 13 protons, so number of electrons will be equal to number of protons.  

Number of electrons = 13  

  b) Number of neutrons = Mass number - number of electrons  = 27 - 13 = 14

3) Electronic configuration of Aluminium is = 1s2   2s2 2p6   3s2 3p1