Hydrogen is the simplest element and therefore has the smallest atom size. Therefore people in this group usually tend to feel themselves as small and insignificant, possibly due to self-esteem problems. But in general tend to be neutral, because hydrogen can easily have a positive charge and a negative charge. Have the ability to bond with almost anyone and to keep that bond stable, but whether that link is friendly or full of hatred depends on the other element. Hydrogens are often underestimated, because of that apparent insignificance.
As helium is a noble gas and therefore very unreactive, these people tend neither to give nor receive, very lazy, possibly self-centered, do not have many goals in life and tend to take life as it is. They are very strongly down to earth people and hardly bond with others at all. Unlike many other elements they can be very happy when alone.
Carbon is pretty much at the centre of the periodic table (Gp 4, Period 2) These are very neutral people. Just like Hydrogens they can bond to many other elements too, but are not often underestimated like Hydrogens are. They are pretty much unbiased people who are relatively happy with their life and can be slightly down to earth. Just like all the atomic masses in periodic table are considered relative to 1/12th of carbon atom mass, the same with people - these people can be considered as middle ground while all others are pulled to the extremes relative to Carbons.
Great givers and are very reactive in doing so as sodium is very reactive. They are active people too but in a way that they prefer others to push them, so they tend to like all the negative category elements so that they can give and those elements receive. Opposites attract.
As uranium is radioactive it is very unstable, meaning that these people are the most unstable of them all. They constantly change their mind and almost never have a definite opinion about anything. Watch out what you say around them as reaction produced by them can be very unpredictable, just as unpredictable as when they might react and when not.