Observe the graph for elements with atomic number 1to 10 ( atomic number is plotted along
the Y – axis) .Answer the questions based on the graph and related concepts. (1x5=5)
1. Name the element with only one shell and that shell is complete.
2.The element in which second shell has twice the element as its first shell.
3. How does valence electrons vary from Li to Ne ?
4. The element with 7 valence electrons.
5. Draw the Bohr model of the ion formed by oxygen.
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the element with only one shell and the shell is complete is helium the element which complete second sale twice the element by the first cell is neon the valence is of the electrons of lithium is one because the last cell is only one electron so valency is one and neon is is zero because the second sale is it 8-8 is0 chlorine is the element which has valency 7 the symbol of oxygen is O2
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