Question

which of the following atoms would have approximately half the mass of an average mercury atom? choose 1 answer: a zirconium (atomic number 40) b ruthenium (atomic number 44) c fermium (atomic number 100)

Explanation:

Step1: Find mercury's atomic mass

Mercury (Hg) has an atomic number of 80 and an average atomic - mass of approximately 200.6 atomic mass units.

Step2: Calculate half of mercury's mass

Half of 200.6 is $\frac{200.6}{2}=100.3$.

Step3: Check the atomic masses of the given elements

Zirconium (Zr) has an atomic mass of approximately 91.2. Ruthenium (Ru) has an atomic mass of approximately 101.1. Fermium (Fm) has a very high atomic mass (much larger than 100.3 as it has an atomic number of 100).

Answer:

B. Ruthenium (atomic number 44)