2. Wskaż zestaw symboli pierwiastków chemicznych, które w przyrodzie występują w postaci cząsteczek dwuatomowych. A. N, I, Na, Br B. H, Ar, O, F C. Cl, H, Br, O D. Al, N, F, H

Calculate the number of molecules present in 0.750 mol of mgo.

Light waves can move through , but they travel fastest when they move through a(n) .

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