Why is the r. a.m. value used? O A. Atoms are too small for their masses to be measured directly.
B. A single atom cannot be isolated, so only the average size of a group of atoms can be
measured.
C. The ra
r. a.m. value is used to determine how many isotopes an element has.
D. None of these

The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

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?

What conclusion can you draw from this experiment about the components of the black ink?