Element Z has 2 isotopes. A sample of element Z contains 19% Z234 and 81% Z236. What is the average atomic mass of the element Z?

Wt Avg of the two isotopes = 235.62 amu

Explanation:

Given:

                                    abundance

Isotope     %      fractional     mass (amu)         Wt. Avg. Contributions

Z234        19%        0.19              234                (0.19)(234) = 44.46 amu

Z236        81%        0.81              236                (0.81)(236) = 191.16 amu

Collective Wt. Avg. of all isotopes = ∑ Wt. Avg. Contributions

= 44.46 amu + 191.16 amu = 235.62 amu

if two electrons have the same n, the same ℓ, and the same ml, then they are in the same orbital. the pauli exclusion principle states that no two identical fermions (a fancy word for electrons and other subatomic particles like electrons) may occupy the same quantum state in an atom simultaneously.

a. they are both space stations

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