3. The Macy's Thanksgiving Day parade is famous for its giant balloons. The Cheerios Bee balloon holds 4.044x10'L of He. If the density of He is 0.000178 kg/L, what is the mass, in kg, of the hellum in that balloon? Work: Calculated # sig figs Final Answer with Units

The air is going to come out because of the low pressure.

You use the atomic number to find out how many protons and neutrons there are in the atom. you use the atomic mass to find out how many protons and electrons there are in the atom. 

While unproven, it uses facts to support part of a conclusion. it is still factual and has predictive power, however.

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf