Question

Which of the following has the maximum size.?
(A)-- Na
(B)--Al
(C)--Mg
(D)--O

Answer 1

heyaa. sodium
is the ans...I hope helps uh.........thanks

Answer 2

The correct option is A.

• As we from Na to Oxygen the atomic number increases slowly and an extra electron is added to the orbital.
• As the electron density increases in the orbital of an atom, the nucleus attracts the electrons more strongly. Thus the size of the atom decreases.
• So, the order of the atomic size of Na, Al, Mg and oxygen is as follows-
• Na>Mg>Al>O.
• Thus Na has the maximum size.