What are two elements scientists should investigate, which could substitute for two of the five other elements (O, C, H, N, S) we know to be essential for life?

a. Si, Na
b. SK
c. As, Si
d. S,F

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