Bromine is the only nonmetal that is a liquid at room temperature. Consider the isotope bromine-81, . Select the combination which lists the correct atomic number, neutron number, and mass number, respectively.
A)35, 46, 81
B)35, 81, 46
C)81, 46, 35
D)46, 81, 35
E)35, 81, 116

Question

Bromine is the only nonmetal that is a liquid at room temperature. Consider the isotope bromine-81,  . Select the combination which lists the correct atomic number, neutron number, and mass number, respectively.
A)35, 46, 81 
B)35, 81, 46 
C)81, 46, 35 
D)46, 81, 35 
E)35, 81, 116

Quizplus · Accepted Answer

The atomic number of bromine is 35, which is the number of protons in the nucleus. The neutron number can be found by subtracting the atomic number from the mass number. The isotope bromine-81 has a mass number of 81, so the neutron number is 81-35=46. Therefore, the correct combination is 35, 46, 81, which is given in choice A.

Bromine Is the Only Nonmetal That Is a Liquid at Room