Multiple Choice
How is the modern periodic table primarily arranged?
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4. Atoms and Elements
Periodic Table: Classifications
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Which major element is a primary component of human bones (mainly as calcium phosphate in hydroxyapatite)?
A
Iron (Fe)
B
Sodium (Na)
C
Calcium (Ca)
D
Chlorine (Cl)
Verified step by step guidance1
Understand that human bones are primarily composed of a mineral called hydroxyapatite, which gives bones their hardness and strength.
Recall that hydroxyapatite is a crystalline structure mainly made up of calcium, phosphate, and hydroxide ions.
Identify the major elements involved in hydroxyapatite: calcium (Ca), phosphorus (P), oxygen (O), and hydrogen (H).
Recognize that among the given options, calcium (Ca) is the primary element that forms the backbone of hydroxyapatite in bones.
Conclude that calcium (Ca) is the major element in human bones, while iron (Fe), sodium (Na), and chlorine (Cl) are not primary components of bone mineral.
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