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Why second ionization enthalpy is always higher than the first ionisation enthalpy for every element?

Important Questions on Classification of Elements and Periodicity in Properties

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Alpha Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>Exercise-1>Q 11
The first ionization enthalpy of carbon is greater than that of boron, whereas the reverse is true for second ionization enthalpy. Explain.
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Alpha Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>Exercise-1>Q 12
Among the elements B, Al, C and Si.

(i) Which element has the highest first ionisation enthalpy?

(ii) Which element has the most metallic character?

Justify your answer in each case.

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Alpha Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>Exercise-1>Q 13
Be and Ne have positive values of electron gain enthalpy against the general trend in their period in modern periodic table. Explain.
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Alpha Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>Exercise-1>Q 14
Nitrogen has positive electron gain enthalpy whereas oxygen has negative. However, oxygen has lower ionisation enthalpy than nitrogen. Explain.
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Alpha Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>Exercise-1>Q 16

Explain the following according to Modern periodic table:

(a) Electronegativity of elements increase on moving from left to right in a period.

(b) lonisation enthalpy decrease in a group from top to bottom.

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Alpha Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>Exercise-1>Q 17
The period number in the long form of the periodic table is equal to
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Alpha Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>Exercise-1>Q 18
Which of the following statements related to the modern Periodic Table is incorrect?
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Alpha Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>Exercise-1>Q 19
Which of the following statements is not correct regarding hydrogen: