Dmitri Mendeleev arranged the Periodic Table of Elements in the order of increasing atomic masses.Isoelectronic: These are atoms/molecules/ ions containing the same number of electrons.Isotones: These are atoms of different elements having the same number of neutrons.The isotopes of hydrogen are Protium, Deuterium and Tritium.Isotopes: These are atoms of the elements having the same atomic number but a different mass number.The atomic number is the number of proton or electrons in an atom of the element is called the atomic number.The mass number is the sum of a number of protons and neutrons in an atom of the elements is called the mass number.They differ in the chemical property but has the same physical property.These are atoms of the elements having the same mass number but different atomic numbers.The atomic number of argon 18 and an atomic number of calcium is 20. Calcium and argon have a mass number of 40. Calcium and argon are examples of a pair of Isobars.After the risks caused by the flammability of hydrogen became apparent, it was replaced with helium in blimps and balloons.Helium-oxygen breathing gas is often used by deep-sea divers at depths of seawater over 55 m (180 ft). ![]()
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