isotopes isobars and isotones

Isotopes - These are the elements having same atomic number but different mass number. They have the same atomic number because the number of protons inside their nuclei remains the same. The difference in their mass number is due to the difference in their number of neutrons. Since they ..

Isotopes are chemically same and physically different. But the converse is true in isobars. That is isobars are elements, which are chemically different but physically same. So, isobars are atoms of different elements having the same atomic mass but differen..

. Atoms with the same number of neutrons but different number of nucleons are called isotones. Examples: 3 0 S 1 4 , 3 1 P 1 5 , 3 2 S 1 6 . Atoms with the same number of nucleons but different number of protons are called isobars. Example: 4 0 Ca 2 0 and 4 0 Ar 1 8 2 1 1 Pb 8 2..

The indivisibility of an atom was proved wrong, for, an atom can be further subdivided into protons, neutrons and electrons. However an atom is the smallest particle, which takes part in chemical reactions. According to Dalton, the atoms of same element are similar in all respects. This is wro..

Modern Atomic Theory - In view of new discoveries about atoms, Dalton's atomic theory was modified as given below: Atom is no longer indivisible as it has a complex structure of sub atomic particles (electrons, protons and neutrons). Atoms of the same element may posses different relative masses (h..

During radioactive emissions, the product formed as a result of the emission of an a - particle followed by the emission of two b - particles is an isotope of the parent elemen..