A compound was discovered whose composition by mass is 85.6% C and 14.4% H. Which of the following could be the molecular formula of this compound? A. C2H6.
B. C3H8.
C. C2H4.
D. CH4.
E. C3H4.

How does a scientist the government? a. the scientist tells people in society what to do. b. the scientist determines the policies that the government spends money on. c. the scientist provides unbiased information to the government. d. the scientist makes laws based on his or her research results.

This is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table.

Consider the elements bromine and chlorine; which elements has a larger ionic radius ?