Nguyên tố R có 3 đồng vị là X, Y, Z. Tổng số hạt của 3 đồng vị là 186. Số notron của động vị X ít hơn số notron của đồng vị Y là 2 hạt. Đồng vị Z có số proton bằng số notron. Số khối của đồng vị X là bao nhiêu?

This graph gives information on changes in sea ice extent in the arctic ocean over a 30-year span. the overall trend shows in the ice extent. to address the trend, scientists need to ask themselves, one direct consequence of the trend is that

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

We are hoping to create 5.72 grams of glucose. the plant was given 4.75 liters of co2 and 2.81 g of h20. which reactant was the limiting reagent? how much excess mass did we have of the other reactant?