Question

an element of 'X' had a mass number of 27 and it contains 13 protons.i)Write the symbolic representation of the element.
ii)Find the number of neutrons and electrons.
iii)Write the electronic configuration of the element.

Answer 1

Element with 13 protons is Aluminium.
Its symbol is Al

representation→ 13Al27

since it is a neutral atom therefore number of protons will be equal to number of electrons.

hence number of electrons is 13

number of neutrons=mass number of protons
=27-13
=14

its electronic configuration=2,8,3.

hope it helps you

Answer 2

I) ²⁷₁₃ X

II) No. of neutrons = Atomic mass - No. of protons

= 27-14 = 13

III) Electronic Configuration -

2,8,3

Since Atomic Mass is 27 and Atomic Number is 13, the element must be Aluminium (Al).

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