A Hexagonal Closest-Packed Structure Has Hexagonally Arranged Layers of Atoms

question 14

Multiple Choice

A hexagonal closest-packed structure has hexagonally arranged layers of atoms stacking in the series ________

• A)ababab
• B)abcabcabc.
• C)abcbabcbabcba.
• D)abacabacaba.
• E)aaaaaa.

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Definitions:

Parathormone

A hormone produced by the parathyroid glands that regulates calcium levels in the blood.

Parathyroid

Small endocrine glands located close to the thyroid gland.

Pituitary

A small gland at the base of the brain that produces hormones influencing growth, metabolism, and reproductive functions.

Adrenal

Pertaining to the adrenal glands, which sit atop each kidney.