Hydrogen bonds are formed between molecules when hydrogen is covalently bonded to an element that has a 1
small atomic radius and low electronegativity
2
large atomic radius and low electronegativity
3
small atomic radius and high electronegativity
4
large atomic radius and high electronegativity
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Hydrogen is covalently bonded to an element that has a small atomic radius and high electronegativity.  

•An intermolecular attractive force in which an atom of hydrogen, which is bonded covalently to a small, highly electronegative atom is known as a hydrogen bond.  

•Hydrogen bonds are very strong in comparison to other dipole interactions.  

•A typical hydrogen bond exhibits a strength of about 5 percent of that of a covalent bond.  

•Hydrogen bonding takes place only in molecules where hydrogen bonding is bonded covalently to one of the three elements, that is, oxygen, fluorine, or nitrogen.  

Thus, correct answer is option 3.

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choice 3

Explanation:

Hydrogen bonding occurs when a H is bonded to a highly electronegative atom like F. Towards the upper right corner, most atoms have high electronegativity and small atomic radii, according to periodic trends.

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radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.