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According to Dalton that An Atom is and invisible, hard dense sphere, Atoms of the same element are alike, Atoms combine in different ways to form a compound. In 1932 James chadwick discovered a neutron. When he bom-barded alpha particles on a beryllium target He observed that highly penetrating radiations were produced.
Structure of Atom Lesson 2 Chemistry Online Test 9th Below
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50%
92%…… hurrah 🙂
93%?
100%
Yes 83%
yes 58% 🙁