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Be and Ne have positive values of electron gain enthalpy against the general trend in their period in modern periodic table. Explain.

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 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:
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Alpha Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>Exercise-1>Q 20
Atomic number of Ag is 47. In the same group, the atomic numbers of elements placed above and below Ag in Long form of Periodic table will be:
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Alpha Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>Exercise-1>Q 21
In modern periodic table, the element with atomic number Z=118 will be:
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Alpha Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>Exercise-1>Q 22
The order of screening effect of electrons of s,p,d and f orbitals of a given shell of an atom on its outer shell electrons is :