Answer:
1 and 3. Option B is correct.
Explanations:
12) What is a covalent bond?
Covalent bonding between elements involves the sharing of electrons among the elements in order for the elements to have a complete shell. These electron pairs are known as shared pairs, and this stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.
The individual element with the given electronic structures are;
• Element 1 = Hydrogen
,
• Element 2 = Lithium
,
• Element 3 = Nitrogen
,
• Element 4 = Magnessium
,
•
From the elements listed, only Nitrogen and Hydrogen have the tendency to form a covalent compound. The electron in the outermost shell of hydrogen is shared with the nitrogen element to produce the ―NH compound whose electrons it shared unequally.
The high electron affinity of hydrogen makes the hydrogen to take on a slight positive charge.