Which of the following elements have unstable electron shells?
a. hydrogen (h)
b. chlorine (cl)
c. calcium (ca)
d. all of these

Chemical kinetics what was the rate of reaction in trial 3? choose the closest answer.

Which of these is an example of pseudoscience? a) predicting the time of sunrise based on data on position of earth b) predicting the date of the moon phases based on data on position of earth c) predicting eclipses based on the position of the sun and the moon d) predicting future events in a person's life based on the position of the moon

What properties would have caused early researchers to name hydrogen "inflammable air”