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2. Ionisation potential is the amount of energy that is needed to remove a loosely bound electron from the valence shell of an isolated gaseous atom to form a cation i.e. a positively charged ion

Across the period the ionization energy increases due to increased nuclear charge and decreased atomic size.

3. No. A woman with a blocked fallopian tube cannot give birth to a child. It is because fertilisation takes place in the woman's fallopian tube. If the fallopian tube is blocked, the egg released from the ovary would not be able to pass through the blockage. As a result, the egg and sperm won't be able to meet and fertilisation would not take place.  

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