The results of an investigation are usually more reliable if A.
it is done outside.
B.
it is done only once.
C.
it is done using a ruler.
D.
it is done more than once.

It is done more than once. D

A test will be reliable when it gives the same repeated result under the same conditions.

D. it is done more than once

Explanation:

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There is one s orbital, and there are three p orbitals, five d orbitals, and seven f orbitals. thus, the answer is b. do not confuse the number of orbitals in a subshell with the number of electrons the subshell can hold. each orbital can hold two electrons, so the capacity of an nf subshell is 14 electrons.