Why Was Moseley So Sure from His X-Ray Work That

question 64

Multiple Choice

Why was Moseley so sure from his X-ray work that there were no other undiscovered elements besides the three that he predicted in the range of atomic numbers 13-79?

• A)The rows on the periodic table were filled.
• B)The columns of the periodic table were full.
• C)All of the possible atomic weights were assigned.
• D)All of the integer atomic numbers were assigned.
• E)Mendeleev didn't predict any more.

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Structure Indicated

Referring to a particular physical or anatomical part identified for study or treatment.

Flap-Like Structure

A piece of tissue or material that is attached on one side, often found in biological or mechanical contexts, serving various functions such as regulation or protection.

Larynx

The voice box; an organ in the top of the neck involved in breathing, producing sound, and protecting the trachea against food aspiration.

Tertiary Bronchi

The third level of branching airways in the lungs, extending from the secondary bronchi to the bronchioles.