Q4 of 60 Page 140

The element with atomic number 18 belongs to which group:

If we break this configuration the we see that it is 2,8,8 which completely fills the atom do it belongs to the Noble Gases.

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2

The order of decreasing atomic size is:

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The order of decreasing atomic size is:

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The scientist who showed that the atomic number of an element is a more fundamental property than its atomic mass is:

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When Mendeleev started his work, the number of known elements was: