Multiple Choice
Which major element is a primary component of human bones (mainly as calcium phosphate in hydroxyapatite)?
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4. Atoms and Elements
Periodic Table: Classifications
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In the periodic table, what is a period?
A
A horizontal row of elements
B
A diagonal sequence of elements that share the same number of valence electrons
C
A classification for elements with similar chemical properties regardless of position
D
A vertical column of elements (a group)
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