Reference Groups: A reference group is any group of people that individuals use as a standard for evaluating themselves and their own behavior (Schaefer). The term reference group was coined by Herbert Hymen in 1942 in a study of social class.
Fill in the orbitals according to the number of electrons in your atom. For instance, if we want to write an electron configuration for an uncharged calcium atom, we'll begin by finding its atomic number on the periodic table.
Question:I know that the electronic configuration of Cr only is [Ar] 3d5 4s1. But how about Cr2+? Answers:[Ar]3d4 4s0 elimination of electron starts from the outermost shell. Question:Write the electron configuration for the sodium atom and for the simple ion it most commonly forms. Indicate which noble gas has the same electron configuration as the ion. I've got about 20 more of these problems and I haven't a clue how to answer them. I'm hoping somebody can explain this to me so I can figure out the rest on my own.