Question

H and D isotopes of hydrogen form H2O and D2O with oxygen. Which of the following you

think right for the above observation.

(A)H and D have same number of protons

(B) H and D have same no. Of neutrons

(C) A and D have same no. Of electrons

(D)H and D have same mass number.m​

Answer 1

(C) H and D have same number of electrons is the correct answer.  

• Oxygen has valency of -2. To complete it's octet, oxygen requires 2 electrons.
• As mentioned in question, two atoms of hydrogen and deuterium react with oxygen to form H2O and D2O.
• Thus, each H atom and D atom donates one electron to oxygen respectively, thus helping it to complete it's octet.
• Hydrogen and all its forms have one proton and one electron. They vary with respect to the number of neutrons.