Question

How are elements arranged on the periodic table?

Answer 1

Hint: As we know that elements are arranged in the long form of periodic table basically on the basis of the fundamental properties that is the number of protons present within an atom’s nucleus.

Complete step by step answer:
- As we know that earlier, Mendeleev arranged the elements in the periodic table according to the atomic mass. But later, Henry Moseley modified the periodic table on the basis of atomic numbers.
- As we know that Elements are arranged in the long form of periodic table from the top to the bottom and from left to right in the increasing order of atomic number.
- Same properties occur periodically when the atoms are arranged according to their increasing atomic number. And this is found to reduce the length of the periodic table as the isotopes are no longer mentioned. As we know that electronic configuration can be easily traced as the atomic number is the same as the number of electrons present.
- It is found that atomic numbers also help to understand the trends of each period and row by telling us atomic size. We can see that these are some of the benefits of arranging elements in order of their atomic number. And all this is found to lead to more accurate organisation of the periodic table.

Note: - As we know that the atomic number represents the number of protons in the nucleus of an atom. Hence, we can say that elements in the long form of the periodic table are arranged in the increasing order of the number of protons.