Avogadro’s number is a constant that helps scientists count atoms and molecules. It is approximately equal to 602,200,000,000,000,000,000,000. How is this number expressed in scientific notation? A. B. C. 6.02/1023 D. 6.02 × 1023 E. 6.02 × 10-23

In all living cells dna controls cellular activities by

Which substances have the lowest melting points: ionic covalent, or metallic

Use this information to determine the number of calends electrons in the atoms. which of the following correctly compares the stability of the two atoms? a) both are unreactive b) both are highly reactive c) a is unreactive and d is reactive d) a is reactive and d is unreactive