There are 6.50 g of ²⁴Na after 60 hours. How many grams were in the original sample if its half-life is 15 hours? Your answer must include the math used to arrive at the answer.

What are the first two quantum numbers for the electrons located in subshell 4d? what are the first three quantum numbers for the electrons located in subshell 2s? how many electrons can be held in a sublevel l = 3? how many electrons can be held in the energy level n = 4? how many electrons in an atom can share the quantum numbers n = 4 and l = 3?

How does the motion of particles in a gas change as the gas cools

How many oxygen atoms are there in 3.15 moles of hcl manganese (iv) oxide, mno2