What characteristic shared between chlorine, fluorine, and bromine makes them have similar properties?

a. all have two electrons in their first energy levels.
b. all have the same number of protons in their outermost energy levels.
c. all have a similar state of matter.
d. all have seven valence electrons.

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? a. the balloons both rise. the cold balloon is larger than the warm balloon. b. the balloons rise at the same rate. both balloons are the same size. c. the warm balloon expands and rises. the cold balloon shrinks and sinks. d. the cold balloon expands and rises. the warm balloon shrinks and sinks.

Which two scientific disciplines are bridged by pharmaceutical drugs? chemistry and forensics chemistry and medicine biology and forensics biology and criminology

If 3 moles of a compound use 24 j of energy in a reaction, what is the a hreaction in j/mol?