Answer:
\[{{\Delta }_{i}}{{H}_{1}}\] value
is the energy needed to remove first electron from the gaseous atom. With the
loss of the electron, the hold of the nucleus on the remaining electrons
increases. Therefore, greater energy is needed to remove the second electron
from the gaseous atom. The \[{{\Delta }_{i}}{{H}_{2}}\]value of an element is
always more than its \[{{\Delta }_{i}}{{H}_{1}}\] value. For detail, consult
text part.
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