To fulfill the octet rule, electron sharing leads to how many electrons around each atom? 4 5 7 8

Flourine is found to undergo 10% radioactivity decay in 366 minutes determine its halflife

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

Identify the missing numbers below to show the result of multiplying the numbers (1.6 × 10-19)(5.0 × 106) = c × 10d