Moles= mass divided by Molecular mass
Moles= 251.4 divided by 84
Moles=2.99
Rounded up is 3
Discovered the necleus
proposed the proton existence
discovered fusion reaction from fission
Explanation:
As you cool a matter to absolute zero, their kinetic energy reduces significantly and the molecules slows down and begins to aggregate together.
- Cooling involves the removal of heat energy from a body.
- Heat increases the thermal energy of system.
- As heat is added, the molecules gain more kinetic energy.
- This shown in their increase motion.
- When heat is withdrawn, the particles slows down.
Answer:
A.in Group 8A (far right-hand side)
Explanation:
The so-called noble gases are found in group VIIIA of the periodic table, on the right side. It corresponds to the gases: Neon, Argon, Xenon, Helium, Radon, Helium.