Answer:
C. Light slows down as it goes through more dense materials.
Hola!
We know,
1 Mole of anything has 6.02 ×

particles
According to Question,
6.02 ×

= 1 Mole
Thus,
1.8 ×

/ 6.02 ×

= 0.33 Moles
hope it helps!
4.2 grams i think i hope this helps
Always use least amount of sig figs possible. So this 9.7 would be (answer): 2 sig figs
The original radioisotope underwent double-alpha decay, where the original nucleus lost a total of 4 protons and 4 neutrons.
The original radioisotope would have an atomic number of 86+4 (protons), and would have an atomic mass of 222+8 (protons + neutrons). This would make the element Thorium-230, or 90Th230.