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CBSE Class 9 Answered

(i) Why is large part of the atom neglected when calculating the mass of the atom?(ii) Give reason why atoms combine with each other.(iii) In the notation of an atom, how are the atomic number, mass number, and symbol of the element written?
Asked by Topperlearning User | 17 Mar, 2015, 08:53: AM
answered-by-expert Expert Answer

(i) The large or extra nuclear part of the atoms contains electrons which have negligible mass. Heavier particles like protons and neutrons are contained in nucleus. So, only nucleus is taken into account when calculating the mass of an atom.

(ii) The atoms combine with other atoms to achieve the electronic configuration of nearest noble gas and thus to become more stable.

(iii) In the notation of an atom, the atomic number, mass number and symbol of the element are to be written as:

begin mathsize 12px style Symbol presubscript Atomic space number end presubscript presuperscript Mass space number end presuperscript space of space element end style

Answered by | 17 Mar, 2015, 10:53: AM
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