객관식
Which of the following best describes what the whole numbers on the periodic table represent?
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2. Atoms & Elements
Atomic Mass
Multiple Choice
Which element in the nonmetal halogen family has an atomic mass closest to 35?
A
Chlorine (Cl)
B
Iodine (I)
C
Bromine (Br)
D
Fluorine (F)
검증된 단계별 안내1
Identify the halogen elements listed in the problem: Fluorine (F), Chlorine (Cl), Bromine (Br), and Iodine (I).
Recall that the atomic mass of an element is the average mass of its naturally occurring isotopes, measured in atomic mass units (amu).
Look up or recall the approximate atomic masses of each halogen: Fluorine (~19 amu), Chlorine (~35 amu), Bromine (~80 amu), and Iodine (~127 amu).
Compare these atomic masses to the target value of 35 amu to determine which element's atomic mass is closest.
Conclude that Chlorine (Cl), with an atomic mass close to 35 amu, is the element in the halogen family that matches the given criterion.
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