Consider the two electron arrangements for neutral atoms a and b. what is the atomic number of a?
a - 152, 252, 2p6,35
b - 152, 252, 2p6,5s
a.11
b.8
c.19

How many mmols of tris-hcl are there in 100 ml of a 100 mm tris-hcl buffer solution at ph 8.1? note that the 100 mm refers to the sum of tris and tris-hcl concentrations?

Which is true about metals used for jewelry, such as platinum and gold? a. they have low flammability. b. they have low reactivity. c. they have high flammability. d. they have high reactivity.

What are several ways to reduce the effect of friction