- Element 1 will be divalent and will be highly electropositive
- Element 2 will be divalent and form negative ions and can be shown to be highly electronegative
- Element 3 will not react with other element easily, it will be inert.
Understanding the links between various elements and forecasting their chemical behavior may be done with great ease thanks to the periodic table. Dmitri Mendeleev first proposed it in 1869, and it has subsequently been improved to take on its current form.
We refer to the horizontal rows as periods. Every period denotes a different electron shell or energy level. Groups are the vertical columns. Because they have the same amount of valence electrons, elements in the same group frequently exhibit comparable chemical characteristics.