Question

What kind of information can we read from the period system? How was it built up?

Answer 1

Answer: the information we can get from looking at the periodic table includes but is not limited to: the shape of electron orbitals, electron configuration, and mass of the elements. and here is what I know about how it was formed:

Explanation: as far as i know, one of the first periodic tables of the elements consisted of four elements: water, fire, earth, and air (None of these are actual elements though). One of the next ones had 33 elements, separated into four categories: games, metals, earth's, and non-metals. The final and most up-to-date version of the periodic table (or, these are the categories that mine has) has 118 elements split ugames. 7 groups (columns) and 18 periods (rows) these categories: alkali metals, alkaline earth metals, lanthanides, actinides, transition metals, post-transition metals, metabolism, reactive nonmetals, and noble gases.

Answer 2

First question, periods correspond to the relationship of orbitals, or likely areas in which electrons will be found, inside the outermost shell of the atom. Successive periods down the table correspond to atoms with a more electron-rich core of inner shells.

Second question, British chemist John Newlands was the first to arrange the elements into a periodic table with increasing order of atomic masses. He found that every eight elements had similar properties and called this the law of octaves. He arranged the elements in eight groups but left no gaps for undiscovered elements.