What are the most reactive nonmetals found on the periodic table?

2pos suppose an object in free fall is dropped from a building. its starting velocity is 0 m/s. ignoring the effects of air resistance, what is the speed (in m/s) of the object after falling 3 seconds? give your answer as a positive decimal without units. answer here

Joan writes four numbers on the board in standard form, and then she writes their scientific notation

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %