Select the number of electrons each atom must gain or lose to have a full valence level. use the periodic table if you need . a calcium atom (ca) will a fluorine atom (f) will a lithium atom (li) will an argon atom (ar) will an aluminum atom (al) will

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.

In which block of the periodic table is uranium (u) found? s blockd blockp blockf block

The fact that the total amount of energy in a system remains constant is a(n)