Ans: Modern periodic table was constructed based on atomic number (in the increasing order). Isotopes: The atoms which posses same atomic number but different mass number are called Isotopes.

Isotopes are atoms of same element having different atomic mass but same atomic number ......
however isotopes have not been given separate place in the modern periodic table....
Also, the isotopes of placed with their atom as all of them having same atomic number

I hope it's helpful for us

Placement of Isotopes in the Modern Periodic Table
- Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.
- Isotopes are placed in the modern periodic table based on their atomic number, which is determined by the number of protons in the nucleus of an atom.

Location in the Periodic Table
- Isotopes of an element will have the same chemical properties because they have the same number of protons and electrons, but their physical properties may vary due to differences in atomic mass.
- Isotopes are usually represented by the element's symbol followed by a hyphen and the mass number, such as carbon-12 or carbon-14.
- Isotopes are not given separate placements in the periodic table since they have the same number of protons and, therefore, belong to the same element.
- However, isotopes may be listed separately in tables or graphs to show variations in atomic mass and other properties.

Significance of Isotopes
- Isotopes play a crucial role in various fields such as medicine, industry, and environmental science.
- Radioactive isotopes are used in medical imaging, cancer treatment, and dating ancient artifacts.
- Stable isotopes are used in determining the origin and movement of substances in biological and environmental systems.
- Understanding the properties and behavior of isotopes is essential for research and applications in diverse fields.