Question

question 21
what is the maximum number of covalent bonds an element with atomic number 8 can make with hydrogen?
1
2
3
4
6

Explanation:

Step1: Identify the element

The element with atomic number 8 is oxygen.

Step2: Determine valence electrons of oxygen

Oxygen has 6 valence electrons. It needs 2 more electrons to achieve a stable octet configuration.

Step3: Consider covalent bonding with hydrogen

Hydrogen has 1 valence electron. Each hydrogen - oxygen covalent bond provides 1 electron to oxygen. So, oxygen can form 2 covalent bonds with hydrogen to complete its octet.

Answer:

B. 2