For the reaction given in part a, how much heat is absorbed when 2.60 mol of a reacts? express your answer to three significant figures and include the appropriate units.

Explain which group an element with the electron configuration 1s2 2s2 2p6 3s2 3p6 3d1 4s2 belongs to.

How did planetesmals form planets? a. they broke apart into smaller chunks.b. they collided and stuck together.c. they cooled and pulled ice together.d. they began to rotate.

How hot is the suns corona? (integrated science)