Electron Configuration and Valence Electrons. The electrons in an atom fill up its atomic orbitals according to the Aufbau Principle; Aufbau, in German, means building up..ach element has a number of valence electrons equal to its group number on the Periodic Table. This table illustrates a number of interesting, and complicating, features of electron configuration. Figure %: The periodicity of valence electrons. First, as electrons become higher in energy, a shift takes place.
I took the pregnancy test early at 2 & 3 weeks pregnant, and it came up negative twice. Yet I could feel something was different about my body, even though I had my cycle it fell short a few days, and was very light. Afterwards, I had breast tenderness, and dizziness.
A negative result on a home pregnancy test COULD mean that you are not pregnant, that the test was performed too early, or that there was a problem with the technique or timing. If you suspect that you are pregnant and that you received a false negative, wait for a few days and test again.ypically, if you get a positive pregnancy test, you are pregnant. False positives are pretty rare. As you are just a little late, it could be that your system hasnât had the time to build up a high enough level of hcg in your urine on a continual basis.