Why has nuclear fusion been difficult to develop? A. Fuel for nuclear fusion is very rare.
B. Fusion normally occurs in the vacuum of space and the atmosphere on Earth stops the reaction.
C. An efficient shape to contain the reaction has not been found.
D. It is hard to recreate the extremely high temperatures and pressures found inside stars.

Give the orbital configuration of the phosphorus (p) atom.

How many grams of co(g) are there in 74.5 ml of the gas at 0.933 atm and 30o c?

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.