It is a true fact that ionic crystals are excellent insulators and can hold a large amount of heat before melting or boiling. The correct option among the two options that are given in the question is the first option. Salt is a great example of ionic crystals and we know that it takes a huge amount of time to melt or boil.
Atomic radii increase when going down a group and decreases when going towards the anion periods. So A and D.
Answer:
The reaction in which heat is absorbed from the surrounding is called endothermic reaction.
so
I think it's answer is 2nd option.
Explanation:
Fe. O
72.40/ 56 27.60/16
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1.29/1.29 1.725/1.29
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1. :. 1
<h3>Emperical formula = FeO</h3>
