How many moles are in 25.5g of helium?

Amixture with the same composition throughout is!

Answer explain why it is not possible to deduce a complete order of reactivity.

Which of the following is a conclusion that resulted from ernest rutherford’s scattering experiment? (will mark brainliest) a. the nucleus is negatively charged b. the atom is a dense solid and is indivisible c. the mass is conserved when atoms react chemically d. the nucleus is very small and the atom is mostly empty space