Which element is a halogen in period 4?

All atoms of a particular element have identical chemical properties.

hydrogen

An atom cannot be created, divided, destroyed, or converted to any other type of atom.

In nature, the element neon exists as three different isotopes: Ne-20, Ne-21, and Ne-22. Which isotope would be the most abundant in a sample of neon?

A female patient is brought to ER because of a MVA (motor vehicle accident). Her chief complaint is pain in the lower lumbar region. The ER physician orders a lumbar series. Upon questioning, the technologist learns that the patient is pregnant. The ER physician is made aware of the pregnancy but still wants the lumbar spine series performed. What can the technologist do to minimize dose to the fetus and mother?

Hypotheses are not acceptable in the scientific method.

A physician orders an image of the knee that will best demonstrate the styloid process of the fibula without superimposition. Which projection do you perform? 

A patient comes to radiology for a thoracic spine routine. The patient has a history of arthritis of the spine. The radiologist requests that additional projections be taken to demonstrate the zygapophyseal joints. What positions and/or projections would be ideal to demonstrate these structures?

Round 0.052018 to three significant figures.