Which of these statements is true?
a. some molecules may contain no atoms.
b. some elements found in nature exist as molecules.
c. some compounds include only one type of element.
d. some atoms are made of two or more different elements.

How air particles exert a pressure on the inside of the balloon

What is the percentage composition of carbon in the compound ch4

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space