Periodic Trends in Elemental Properties

Effective nuclear charge and screening effect
Periodic trends in physical properties
a) Atomic radius
b) Ionic radius
c) Ionization enthalpy
d) Electron gain enthalpy
e) Electronegativity
Periodic trends in chemical properties
a) Periodic trends in valency
b) Periodic trends in metallic - nonmetallic character
c) Periodic trends in chemical reactivity

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Explain the following.

Cu forms coloured salts while Zn forms colourless salts.

Answer the following question.

Select the smaller ion form the following pair:

K⁺, Li⁺

Answer the following question.

Select the smaller ion form the following pair:

N^3–, F^–

Define electronegativity

Define ionic radius

Answer the following question.

What are the valence electrons?

Give reason.

Alkali metals have low ionization energies.

Explain the following.

The ionic radii of F^Θ and Na^⊕are 133 and 98 pm, respectively.