If the radius of the 1st orbit of hydrogen is 5.29 × 10-11 m, then the radius of the 2nd orbit of hydrogen is ________ × 10-11 m.

If the radius of the 1st orbit of hydrogen is 5.29 × 10-11 m, then

1.	If the radius of the 1st orbit of hydrogen is 5.29 × 10-11 m, then the radius of the 2nd orbit of hydrogen is ________ × 10-11 m.
A.	10.58
B.	2.645
C.	21.16
D.	27.98
Answer» D. 27.98

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If the radius of the 1st orbit of hydrogen is 5.29 × 10-11 m, then the radius of the 2nd orbit of hydrogen is ________ × 10-11 m.

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