Question

Section B: Structured Questions
1.
Y is the ion of an element, X. Y contains 13
protons, 14 neutrons and 10 electrons.
(a) What is the nucleon number of Y?
(b) Draw the electronic structure of an atom of X.
(c) Deduce the formula of the oxide formed by
element X.

Answer 1

Explanation:

here, (a) Nucleon is the sum of protons and neutrons present in nucleus.

so, Nucleon number of Y = 13 Protons + 14 Neutrons

                                          = 27 Nucleon

(b) It is in the attachment.

Its electronic configuration = 1s² 2s² 2p⁶ 3s² 3p¹  or  2, 8, 3

(c) We know that number of protons = Atomic number of an atom

so, Atomic number = 13 it is a Aluminium

∴  Al         O

   +3        -2         this is the valency of both.

by criss cross method the oxide Aluminium is Al₂O₃.

hope it will help you.