All you have to do is figure out the word for the blank. pls help me

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For a child to have symptoms of an autosomal recessive disorder, the child must receive the abnormal gene from both parents. Because most recessive disorders are rare, a child is at increased risk of a recessive disease if the parents are related.

They are all full and don't need any more electrons in there outer shell.

The correct answer should be "electrons orbit the nucleus in circular motions exactly as shown on the classic bohr model."