Question

1 )What do you understand by the term nucleus of an atom?
2)Who proposed the existence of neutron and what was the basis of this assumption?
3)Define atomic number. Why is it called the main characteristic property of the elements?​

Answer 1

Answer:

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Explanation:

1. The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom,
2. Ernest Rutherford. His explanation for this was the existence of a neutrally charged particle within the atomic nucleus. He considered the neutron to be a neutral double consisting of an electron orbiting a proton.
3. The atomic number (Z) of an element is the number of protons in the nucleus of each atom of that element. This means that the number of protons is the characteristic which makes each element unique compared to all other elements. Elements are different because of their atomic number.