Fill in the blanks given below:
$(i)$ The attractive force which holds atoms,molecules,and ions together is called ......... .
$(ii)$ First of all,............ and ............ scientists provided detailed information about valency.
$(iii)$ In the structure of an atom,when only the electrons of the outermost shell participate,they are known as ............ .
$(iv)$ The symbol used to represent valence electrons in an atom is called ........ .

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(N/A) $(i)$ Chemical bond
$(ii)$ Kossel and Lewis
$(iii)$ Valence electrons
$(iv)$ Lewis symbol

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Which of the following molecules can show Lewis acidity?
$(I)$ $CO_2$ $(II)$ $Br_2$ $(III)$ $SnCl_2$ $(IV)$ $HF$ $(V)$ $NMe_3$

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Consider the following compounds:
$I. H_3X-NCS$
$II. H_3Y-NCS$
$III. (H_3X)_2O$
$IV. (H_3Y)_2O$
The incorrect statement regarding the given compounds is:

The order of the average bond length of the given bonds is

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