Flourine has an atomic number of 9. You would expect fluorine would like to do which of the following?
give up all seven electrons, acquiring a positive charge
to be nonreactive with other atoms
to accept an electron from another atom, acquiring a negative charge
to give up four of its electrons, acquiring a positive charge
The Correct Answer is C
A. give up all seven electrons, acquiring a positive charge: Fluorine has 7 valence electrons and needs 1 more to complete its outer shell; it’s unlikely to give up 7.
B. to be nonreactive with other atoms: Nonreactive atoms have full outer shells, like noble gases. Fluorine is highly reactive.
C. to accept an electron from another atom, acquiring a negative charge: Fluorine is highly electronegative, so it gains 1 electron, becoming a negative ion (anion).
D. to give up four of its electrons, acquiring a positive charge: Fluorine doesn’t have four valence electrons to give; it wants one more, not to lose.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. monosaccharides: Monosaccharides are the building blocks of carbohydrates, not lipids.
B. a glycerol plus three glycogen chains: Glycogen is a polysaccharide, not a component of triglycerides.
C. a glycerol plus three amino acid chains: Amino acids form proteins, not triglycerides.
D. a glycerol plus three fatty acid chains: A triglyceride is made of one glycerol molecule and three fatty acids-this is the primary structure of fats.
Correct Answer is A
Explanation
A. compounds that are ionically bonded together: Ionic compounds (like NaCl) dissociate easily in water because water's polarity can separate the positive and negative ions.
B. carbon-hydrogen chains, like saturated fats: These are nonpolar covalent compounds and are hydrophobic, so they don’t dissolve or dissociate well in water.
C. compounds that are covalently bonded together: Covalent bonds are strong and molecules remain intact in water; they don’t dissociate into ions.
D. compounds with covalent and some polar covalent bonds: These might partially dissolve but don’t dissociate readily into ions like ionic compounds do.
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