Justify must new substances be formed when you observe a chemical property ? explain

Asingle atom of an element has 21 neutrons, 20 electrons, and 20 protons. which element is it? ok o z

Will mark brainliest 26. which of these statements are true? (3 points) a. gases are compressible b. gases fill their containers completely c. the pressure of a gas is independent of the temperature d. gases have mass e. gases exert pressure f. the pressure of a gas is dependent on the volume g. gas pressure results from the collisions between gas particles h. gases have a definite volume and shape

(apex) when a cup of water is dropped, as the cup falls, the water in the cup falls out true or false?