Apure chemical substance that consist of one atom with specific chemical properties is called

Compare the valence electron configuration of the nobles gas elements seen here. what statement is correct?

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

Which is an example of the practical pursuit of alchemy? a. forming perfect substances. b. transforming base metals. c. developing metalworking techniques. d. linking spiritual characteristics with material substances.