Here are the atomic masses of hypothetical elements: X = 13. 25 amu

Y = 69. 23 amu

Z = 109. 34 amu

What is the % composition by mass of Y in the hypothetical compound

with formula X2Y5Z3?

Enter your answer to two decimal places. Do not include the % sign, just

the numerical answer.

Me i dont know what to do! the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.