Question

In which one of the following pairs do the two species resemble each other most closely in chemical properties?

• A. ${}_1^1\text{H}$ and ${}_1^1{\text{H}}^{+}$
• B. ${}_7^{14}\text{N}$ and ${}_7^{14}{\text{N}}^{3-}$
• C. ${}_6^{12}\text{C}$ and ${}_6^{13}\text{C}$
• D. All

Answer 1

Answer: (C)

${}_6^{12}\text{C}$ and ${}_6^{13}\text{C}$

A particular atom or molecule has its chemical properties due to electrons and as ${}_6^{12}\text{C}$ and ${}_6^{13}\text{C}$ have same number of electrons i.e. isoelectronic species so they are most closely related in chemical properties.