An unknown element. T. is examined and three isotopes are determined to
be present. 88T = 2.24% 90T = 78.32%
91T = 19.44% What is the atomic mass
of the unknown element X according
to this data set?
O 90.1496 amu
90.15 grams
O 90.1 amu
O 87 amu

Nuclear fusion is the source of energy for stars. besides hydrogen, which other element is most likely also common in stars?

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.

What state of matter is ice a. liquid b. element c. solid d. gas