Answer:
(i) Na has three shells K, L and M but here only 2 shell
are given. Further L shell cannot have more than 8 electrons but here 9
electrons are given.
(ii) The correct structure is
(iii) As Na has 1 valence electrons, thus it has a valency
of +1 and chlorine has a valency of-1
Hence, the formula of its chloride is AC1.
(a) Nucleus
(b) Oxygen and calcium
(c)
Element | Atomic number | Proton | Electron | Neutron | Mass number |
A B C | 17 14 9 | 17 14 9 | 17 14 9 | 18 14 19-9=10 | 17+18=35 14+14=28 19 |
Particles | Atomic number | Mass number |
A B C D | 3 9 8 9 | 3 = 4 =7 9 + 8 = 17 8 + 8 = 16 8 + 10 = 18 |
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