Which of the following is the best description of an element? a
A material that has a specific shape at a specific temperature
b
A pair of atoms that have different abilities when joined together
c
A substance that cannot be broken down into simpler substances
d
A naturally occurring mineral made of more than one substance

c . A substance that cannot be broken down into simpler substances

Explanation:

The best description of an element is that it is a substance that cannot be broken down into simpler substances.

An element is a pure substance but it is the simplest unit by which chemical reactions can take place.

a plasma is a warm ionized gasoline consisting of approximately equal numbers of definitely charged ions and negatively charged electrons. the characteristics of plasmas are notably unique from the ones of ordinary neutral gases in order that plasmas are considered a awesome "fourth kingdom of remember."

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.