An unknown element has two stable isotopes. 92.41 percent of all atoms of this element have a mass number of 7. The remaining 7.59 percent of atoms of this element have a mass number of 6. Which of the following is MOST LIKELY to be true about the average atomic mass
of the unknown element
The average atomic mass is slightly lower than 7 but much higher than 6.
The average atomic mass is 6.5
There is no way to estimate the average atomic mass without knowing the identity of the element.