periodic table with valence electrons labeled

Thus the force of attraction between nucleus and outermost electrons decreases.īecause of this, the electron will be lost easily during chemical reaction.

Reactive metals are those metals which show high tendency to lose electron/s in a chemical reaction.įor example, as we move down the group, the atomic size increases. But before that, let us discuss what is a reactivity in metals? What are reactive metals? Here I’ll tell you about the most reactive metal on the Periodic table. Rest of the elements which are shown in yellow color show fewer characteristics of heavy metals. The metals which show less characteristics of heavy metals are Īnd these elements are represented by orange color on the Periodic table. These heavy metals are displayed on the Periodic table with red color (see above image) The metals which show maximum characteristics of heavy metals are On the basis of this criteria, the heavy metals are shown on the Periodic table. Many researchers use the common criteria that if the metals have the density of more than 5 g/cm³, then they are likely to be known as heavy metals. So there is a research work still going on for the specific definition and classification of heavy metals. Whereas in chemistry, chemists are concerned with the chemical properties of heavy metals for defining them. While in physics, they may use atomic numbers for defining heavy metals. In metallurgy, researchers define heavy metals on the basis of density. Well, the definition of heavy metals may differ in metallurgy, physics as well as chemistry. The heavy metals are those metals which possess higher density or higher atomic mass. Thus they are rare in the context of available resources. Rare earth metals are not actually that rare as the name suggests.Įven, they are available in more abundant quantities than gold.īut the fact is that they are spread evenly on the earth and it is very difficult to find these elements at one place on the earth. Atomic number Symbol Name of element 21 Sc Scandium 39 Y Yttrium 57 La Lanthanum 58 Ce Cerium 59 Pr Praseodymium 60 Nd Neodymium 61 Pm Promethium 62 Sm Samarium 63 Eu Europium 64 Gd Gadolinium 65 Tb Terbium 66 Dy Dysprosium 67 Ho Holmium 68 Er Erbium 69 Tm Thulium 70 Yb Ytterbium 71 Lu Lutetiumīut do you know why they are called rare? Why Rare Earth metals are called so?Īnswer: You might be thinking that rare means these elements are available in very less quantity.īut if you are thinking so, then you are wrong. Here is a complete list of all the 17 rare earth metals. Rare Earth Metals includes all the 15 Lanthanides as well as scandium(Sc) and yttrium (Y). There are total 17 Rare Earth metals on the Periodic table.

Periodic table with valence electrons labeled