Bohr's theory can be applied to the hydrogen-like species `(He^(+), Li^(2+),Be^(3+)`, and so on). With the increase of `Z` (atomic number), the value of enegry becomes_____and that of radius becomes________.

Options

A. less negative, larger
B. more positive, smaller
C. less positive, large
D. more negative, smaller

Answer

D

Explanation

`E_(n) = - 2.18 xx 10^(-18) (Z^(2))/(n^(2))J` and `r_(n) = (52.9(n^(2)))/(Z)pm`
With the increase of `Z`, the electron will be tightly bound to the nucleus.