Using the information in the table to the right, calculate the average atomic mass of strontium. Report to two decimal places. amu Practice calculating average atomic mass

Identify one disadvantage to each of the following models of electron configuration: dot structures arrow and line diagrams written electron configurations type in your answer below.

Why do scientists look for patterns in the world? a. patterns can explain observations. b. patterns never change, no matter what. c. patterns are easy for scientists to detect. d. patterns are all the same, through all time.

Classify this reaction: 2al+n2-> aln.