The electrons of an atom are Multiple Choice always equal in number to the number of neutrons in an atom. found in the nucleus. used to determine atomic number. positively charged. moving in pathways called orbitals.

What is the number of moles in 15.0 g ash3?

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.

When the mercury level in a barometer decreases that atmospheric pressure has