Which of these elements has two valence electrons? a. hydrogen b. barium c. nitrogen d. krypton e. bromine

Describe the chemical reaction based on the chemical equation below. also, explain whether the equation is balanced.

You have a sample of a gas that occupies a volume of 17ml at -111 degrees celsius. what volume does the sample occupy at 88 degrees celsius? show all work asap

11. phosphorus-32 is radioactive and has a half life of 14 days. how much of a 124 mg sample of phosphorus-32 is present after 56 days? a) 7.75 mg b) 15.5 mg c) 31.0 mg d) 62.0 mg