Question

An element X has a mass number 27 and it contains 13 protons. (i) Write the symbolic representation of the element . (ii)Find the number of neutrons and electrons in the element. (iii)Write the electronic configuration of the element.

Answer 1

element=Aluminium (Al)
no.of neutrons=mass no.-no.of protons
=27-13
=14
the electronic configuration =1s2 2s2 2p6 3s2 3p1

Answer 2

Aluminium

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

2b) Number of neutrons = Mass number - number of electrons

= 27 - 13

= 14

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

Please refer to the attached picture for the diagram of the electronic configuration.