In the chemical closet, you found an unlabeled vial with a solid piece of an unknown element inside (element Z) You decided to put it in the mass-spec to figure out its atomic mass. The results showed that it has two naturally occurring isotopes, Z-85, and Z-87. Z-85 has a natural abundance of 72.17% and a mass of 84 912 amu Z-87 has a natural abundance of 27 83% and a mass of 86 909 amu. Calculate the average atomic mass and determine the identity of mystery element Z

85.4678

It is Rubidium

Explanation:

A natural abundance of 72.17% and a mass of 84 912 amu

A natural abundance of 27 83% and a mass of 86 909 amu.

Average atomic mass

= 84.912 x .7217 + 86.909 x .2783

= 61.28099+24.18677

= 85.46776

=85.4678

It is Rubidium .

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.