The melting point of MgO is higher than that of NaF. Explanations for this observation include which of the following?
1. Mg2+ is more positively charged than Nat.
II. 02- is more negatively charged than F.
III. The 02 ion is smaller than the Fion.

(A)Il only
(B)I and II only
(C)I and III only
(D)II and Ill only
(E)I, II and III

What is the temperature of one mole of helium gas at stp?

An atom with 7 protons, 6 neutrons, and 7 electrons has an atomic mass of amu. (enter a whole number.) numerical answers expected! answer for blank 1:

Electromagnets coils of wire paper clips picked up 10 3 15 6 20 9 25 12 ms. owens' class was studying magnets. ms. owens showed her students how to make an electromagnet using a nail, a d-cell battery, and plastic coated wire. the students wrapped the wire around the nail and then attached the ends to the battery. when they were finished, they tested their magnets by investigating how many paperclips their magnets could pick up. they also tested whether they could increase the strength of their electromagnets by using more coils of wire. they recorded the class average of their results in the data table seen here. ms. owens asked her students to graph their data in a line graph. how should the students label the x-axis on their line graph? a) size of battery b) number of paper clips c) number of coils of wire d) strength of electromagnet