Question

Two elements X and Y have atomic numbers 12 and 16 respectively. To which period of

the modern periodic table do these two elements belong? What type of bond will be

formed between them and why? Also give the chemical formula of the compound

formed.

3

18 (i) Create a terrestrial food chain depicting four trophic levels.

(ii) Why do we not find food chains of more than four trophic levels in nature?​

Answer 1

Answer:

12 =(2,8,2) = perriod 3(Mg)

16 = (2,8,6) = period 3(S)

they will form ionic bonds

compound = MgS

Explanation:

Answer 2

Answer:

period 3 in modern periodic table

Ionic bond would be formed by them

because one is non metal and other is metal (sulphur and magnesium) respectively

MgS is it's formula

plant - insect - frog - snake

because of less energy available to animals present at higher trophic levels

as only 10% of food from one trophic level passes to other trophic level

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