A system that exchanges mátter or energy with the environment is a closed system​

This image is an example of a(n) a) atom. b) compound. c) mixture. d) molecule.

Astudent is asked to identify and element that is pale yellow brittle solid and does not conduct electricity. at which location in this periodic table would the element most likely be found?

Ahydrogen atom has 1 electron. how many bonds can hydrogen form? a) 1 b) 2 c) 3 d) 4 e) 5