Question

The serial number of an element in a periodic table is also its …………… , …………….

• A. Atomic number
• B. The number of protons

Answer 1

Mendeleev's modified rule — According to this rule, the physical and chemical properties of the elements are periodic functions of their atomic numbers

• It means when we arrange the elements in increasing order of their atomic number, after a certain time same properties of element appear
• Atomic number is also equal to the number of protons
• This rule also helps to arrange the element in systematic order
• By this rule, it is easy to study the element

Thus, The serial number of an element in a periodic table is also its Atomic number, The number of protons