What element has 10 protons and 12 electrons and 10 neutrons

What element breaks down into yttrium-90?

What’s the percent by mass of carbon in c10h14n2

One of the few xenon compounds that form is cesium xenon heptafluoride (csxef7). how many moles of csxef7 can be produced from the reaction of 13.0 mol cesium fluoride with 12.5 mol xenon hexafluoride? csf(s) + xef6(s) csxef7(s)