Consider the following statements with reference to the periodic table of chemical elements 1 Ionisa...........

General Science (Easy) Chemistry

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Consider the following statements with reference to the periodic table of chemical elements:

1. Ionisation potential gradually decreases along a period

2. In a group of elements, electron affinity decreases as the atomic weight increases

3. In a given period, electronegativity decreases as the atomic number increases

Which of these statement (s) is/are correct?

1 only

2 only

1 and 3

2 and 3

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Explanation:

2 only

As we move from left to right in a period, electrons are added to the same shell. As the number of electrons and protons goes on increasing the attraction goes on increasing and atomic size decreases.Thus the outermost shell electrons come closer to the nucleus and are more firmly bound.Thus, more amount of energy is required to remove an electron from the outermost shell and hence, Ionisation Potential increases.