<span>According to modern atomic theory, electrons can't move from one energy
level to another. It is not that it cannot really move but electrons tend to stay at a level with the lowest energy possible. Hope this answers the question. Have a nice day.</span>
Familiar examples of physical properties include density, color, hardness, melting and boiling points, and electrical conductivity. We can observe some physical properties, such as density and color, without changing the physical state of the matter observed<span>.</span>
The elements on the Periodic Table are arranged in order of increasing atomic number. The correct option among all the options that are given in the question is option "2".<span> The
Periodic Table is created in such a manner that the elements having similar
properties are always in the same column. The elements that have the same number
of electron shells are always arranged in the same row. The table is written in
a perfect structural manner for everybody to understand. </span>