Main features of Pteridophyta | Class IX

The plant body is divided into root, stem and leaves. These are non-flowering, vascular and spore bearing plants. The sporophyte…

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General Characterististics of Gases | Class XI

General Characteristics of Gases.  Gases possess the following general characteristics : (i) Shape and volume:  Gases have neither definite shapennor definite…

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What are various factors due to which ionisation enthalpy of the main group elements tends to decrease down a group? | Class XI

(i) Atomic size is inversely proportional to I.E. On moving down the group, atomic size increases, hence ionisation energy decreases.…

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Explain the term Valency of an element. How does it vary in a period and in a group in the periodic table? | Class XI

Ans: The chemical properties of elements depends upon the number of electrons in the outer most shell of an atom.…

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