Question

Two elements X and Y have atomic number 12 and 16 respectively . To which period of the modern periodic table di these elements belong ? What type of bond will be formed between them and why ? Also give the chemical formula of the compound formed?

Answer 1

Explanation:

X= magnesium,

Y= sulphur

both belong to 3 rd period

they will ionic bond due to difference in electronegetivitiy

the formula is MgS2

Answer 2

1) Both belong to 3rd period

2) Ionic bond is formed between them as transfer of electrons take place between X and Y.

3) The chemical formula of the compound will be XY.

Explanation:

Electronic configuration represents the total number of electrons that a neutral element contains.Thus for X element with atomic number 12 contains 12 electrons and for Y element with atomic number 16 contains 16 electrons.

The electrons are filled according to Afbau's rule in order of increasing energies and thus the electronic configuration for X and Y is :

$X:12:1s^22s^22p^63s^2$

$Y:16:1s^22s^22p^63s^23p^4$

In both the configurations, 3 is the highest principle quantum number. Therefore, X and Y belongs to the 3rd period in the periodic table.

As X can lose 2 electrons and Y can gain 2 electrons to complete their octets , thus X can form $X^{2+}$ and Y can form $Y^{2-}$ and react to form neutral ionic compound $XY$.

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