Problem 1
What atom has only one proton? a. hydrogen c. a free radical b. an isotope d. a radioisotope
Problem 2
A molecule into which a radioisotope has been incorporated can be used as a(n) ______. a. compound b. tracer c. salt d. acid
Problem 3
Which of the following statements is incorrect? a. Isotopes have the same atomic number and different mass numbers. b. Atoms have about the same number of electrons as protons. c. All ions are atoms. d. Free radicals are dangerous because they emit energy.
Problem 4
In the periodic table, symbols for the elements are arranged according to _______. a. size b. charge c. mass number d. atomic number
Problem 5
An ion is an atom that has ______. a. the same number of electrons and protons b. a different number of electrons and protons c. electrons, protons, and neutrons
Problem 6
The measure of an atom's ability to pull electrons away from another atom is called _______. a. electronegativity b. charge c. polarity
Problem 7
The mutual attraction of opposite charges holds atoms together as molecules in a(n) __________ bond. a. ionic b. hydrogen c. polar covalent d. nonpolar covalent
Problem 8
Atoms share electrons unequally in a(n) ________ bond. a. ionic b. hydrogen c. polar covalent d. nonpolar covalent
Problem 9
\(\mathrm{A}(\mathrm{n})\) ______ substance repels water. a. acidic b. basic c. hydrophobic d. polar
Problem 11
Hydrogen ions \(\left(\mathrm{H}^{+}\right)\) are _________. a. indicated by a \(\mathrm{pH}\) scale b. protons c. in blood d. all of the above
