Current Question: An isotope has a half-life of 32
days. If you start with 123 g,
how many will remain after 96
days?
625 g
138.375 g
7.6875 g
15.375 g

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.

What are the spectator ions in 2h+ + so42- + ca2+ + 2r → caso4 + 2h+ + 21?

Arrange the elements in order of increasing electronegativity. use the periodic table to you arrange the elements. p o k mg