Fill in the blanks:
$(i)$ Atoms and ions having the same number of electrons are known as ........... .
$(ii)$ The quantitative measure of the tendency of an element to lose an electron is called ........... .
$(iii)$ The screening effect is also known by the name ........... .
$(iv)$ The enthalpy change when a gaseous neutral atom forms a negative ion is called ........... .

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(N/A) $(i)$ Isoelectronic species
$(ii)$ Ionization enthalpy
$(iii)$ Shielding effect
$(iv)$ Electron gain enthalpy

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Which of the following statements are $NOT$ true about the periodic table?
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