Which of the following groups of atoms are most likely to have similar properties?
a. fluorine (9), iodine (53), and astatine (85)
b. boron (5), arsenic (33), and selenium (34)
c. lithium (3), boron (5), and fluorine (9)

Which function is performed by earths atmosphere? a. ultraviolet rays are prevented from reaching the ozone layer. b. earths temperature is raised and moderated by trapping in heat c. charged particles from the sun are prevented from reaching earth. d. magnetic charges from space are prevented from reaching earths surface.

Which characteristic of water it form droplets? a. low specific heat b. nonpolar structure c. high surface tension d. ability to dissolve substances

Can someone me with 3 and 4 plz. this is for masteries test.