Assertion : The radius of the first orbit of hydrogen atom is 0.529 Å.
Reason : Radius for each circular orbit `(r_n)=0.529 Å (n^2//Z)` , where r=1,2,3 and Z = atomic number.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion
B. If both assertion and reason are true but reason is not the correct explanation of the assertion
C. If assertion is true but reason is false
D. If the assertion and reason both are false

Answer

A

Explanation

Both assertion and reason are true and reason is the correct explanation of assertion.
Radius , `r=(n^2h^2)/(4pie^2 mZ)=n^2/Z xx 0.529 Å.r_n` also increases indicating a greater separation between the orbit and the nucleus