Question 2

The development of electron configuration and the arrangement and construction of the periodic table makes us to recognize things in the world what they are made of and how they have been made. This was the way somebody thought his name was Dmitri Mendeleev he tought that it was easy to put those elements together in a table called periodic table. He based them on the atomic weights. This was only the start. After him Henry Moseley determined the atomic number of each element. He ordered them by there atomic numbers. Our periodic table is still ordned like this.

When scientist discover new elements they do that accidentally by putting elements together or they are really trying to with things like spectroscopy. Those new elements will go in the D block al the new elemtns go in there.