Question

3 elements and compounds (continued)
discuss elements and compounds by completing the following paragraph. there are more than 90% naturally occurring elements. seventy - five percent of the universe is 75%. the earths crust and the human body are made of different elements. but __ is an element that is abundant in both. most objects are made of with approximately ten million known and over being developed and discovered every __.

Explanation:

Elements are pure substances made of one - type of atom. Compounds are made of two or more different elements chemically combined. Hydrogen makes up about 75% of the universe's mass. Oxygen is abundant in both the Earth's crust and the human body. Most objects are compounds. New compounds are constantly being developed and discovered.

Answer:

There are more than 90 naturally occurring elements. Seventy - five percent of the universe is hydrogen. The Earth's crust and the human body are made of different elements. But oxygen is an element that is abundant in both. Most objects are made of compounds with approximately ten million known and over thousands being developed and discovered every year.