You should bear in mind that not all nebulae are the same. There are all kinds. But every planet originally condensed out of a nebula, so every element found in a planet such as Earth (not counting those that we have artificially synthesized, such as technitium) is also found in at least some nebulae.
A Nebula is a gas of dust and minerals that surrounds a star. Also, a nebula is a birthplace of a star, where a star and sometimes a solar system is formed after a huge explosions
The Crab Nebula is a nebula.
Triffid Nebula, Eagle Nebula, Cat's Eye nebula
A solar nebula is related to the formation of our Solar System, any other nebula is just a nebula.
nebula
The Stingray Nebula (Hen 3-1357) is a planetary nebula. (The youngest known).
a type of nebula
"The Crab" is a nebula.
A cloud in outer space consisting of gas or dust and planetry nebula is one of the types also called ring nebula or A planetary nebula is an emission nebula consisting of a glowing shell of gas
Emission nebula glow and reflection nebula reflect the light form other stars
The crab nebula.
orion nebula