Choose the missing daughter nuclide from below 1) 232 90 Th→ +4 2 He
2) 224 88 Ra➡️ + 4 2 He
217 88 At 220 86 Rn 206 82 Pb
205 81 Tl 228 88 Ra

Can someone me with questions 12 and 13 plz.

There are 6.022, 104 atoms of hg in 1 mole of hg the number of atoms in 45 moles of hg can be found by multiplying 4.5 by 6.022, 102 which is the number of atoms in 4.5 moles of hg, correctly written in scientific notation with the correct number of significant figures? 0 21,109 0 21,100 271, 1024 27.099, 100 mark this and retum save and exit submit

Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.