Chemistry · JEE

Important Questions: Periodic trends in properties of elements: atomic and ionic radii, ionization enthalpy, electron gain enthalpy, valence, oxidation states and chemical reactivity for JEE

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Q1ChemistryUnit 9: Classification of Elements and Periodicity in Properties

Which element has the most metallic character?

Q2ChemistryUnit 9: Classification of Elements and Periodicity in Properties

Why is there a gradual increase in the ionisation energy from

L i

N e ?

Q3ChemistryUnit 9: Classification of Elements and Periodicity in Properties

A l

has lower ionization potential than that of

M g

because:

Q4ChemistryUnit 9: Classification of Elements and Periodicity in Properties

The set representing the correct order of first ionisation potential is :

Q5ChemistryUnit 9: Classification of Elements and Periodicity in Properties

IP values of an element 'X' are 104 kJ,

200 \mathrm{kJ}, 420 \mathrm{kJ}, 2825 \mathrm{kJ}

per mole Identify the group to which the element belongs ?

Q6ChemistryUnit 9: Classification of Elements and Periodicity in Properties

The graph below shows the atomic radii of atoms in picometers

(\mathrm{pm})

as a function of atomic number. Which letter on this graph most closely shows the location of the transition metals of period 5? Atomic Radius vs. Atomic Number

Q7ChemistryUnit 9: Classification of Elements and Periodicity in Properties

Assertion Atomic size decreases in a period due to increase of atomic number. Reason The nuclear charge is increasing and size of valence shell remains same as we move from left to right. Hence, in any period, the atomic size of the element decreases from left to right.

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Key areas include Periodic trends in properties of elements: atomic and ionic radii, ionization enthalpy, electron gain enthalpy, valence, oxidation states and chemical reactivity. Prioritise these before moving to edge cases.

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