Match the following. Cu
1. argon
Sn
2. barium
1
Ar
3. copper
K
4. hydrogen
Ba
5. manganese
6
6. nitrogen
N
7
7. oxygen
O
11
8. potassium
Zn
9. tin
Mn
10. uranium
U
11. zinc
H

Are hallucinogen a clinically useful drugs?

How many atoms of mg are present in 97.22 grams of mg? 6.022 × 1023 2.408 × 1024 4.818 × 1024 5.855 × 1025

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.