Question

Isotopes of a particular element have nearly similar chemical characteristics because:

• A. their electron configurations are identical
• B. their mass numbers are same
  
• C. the number of neutrons are same
  
• D. none of these
  

Answer 1

Answer: (A)

their electron configurations are identical

Isotopes are variants of a particular chemical element which differ in neutron number, although all isotopes of a given element have the same number of protons in each atom.
Due to having same number of protons these are same elements hence have similar properties.