Question

Solder is an alloy of ${\text{Pb}}$ and _______?

Answer 1

We need to know that the substance is made up of more than one metal known as alloy. Alloy is mainly made to attain both properties of combined metals. Alloys are used to enhance the hardness of the metal, enhance the tensile strength of metal and modify the colour of metals. In the world there are a lot of elements in various forms. For study and developing purposes, classification happens. Periodic table used to study the elements in easy form. If one new element is discovered, it means, based on the physical and chemical properties we placed in the periodic table.

Complete answer:
Solder is one of the alloys. Solder is classified as two types. There are old solder and modern solder. The old solder is made up of lead and tin. The modern solder is made up of copper and tin.
The atomic symbol of lead is ${\text{Pb}}$ and the atomic symbol of tin is ${\text{Sn}}$.
According to the above discussion, we conclude solder is an alloy of ${\text{Pb}}$ and ${\text{Sn}}$.

Note:
In general we move left to right metallic property of the atom decreases. We move right to left and non-metallic property decreases. In the modern periodic table metallic atoms are placed in the left side of the table and non-metallic atoms are placed in the right side of the table. Metalloids and transition elements are placed in between metal and non-metal elements. Below the two rows are there. There are nothing but lanthanides and actinides. These are f-block elements. In chemistry, periodic tables play a vital role. Now we are using a modern periodic table. This modern periodic table consists of totally $118$ elements. In the periodic table there are totally $18$ columns and $7$ rows. The columns are called groups. Hence, $18$ groups in the periodic table. The rows are called periods. Hence, totally $7$ period in the table.