Query 31. What does one understand by bond pairs and lone pairs of electrons? Illustrate by giving a person illustration of Each individual sort.
Mobile Concept and Historical past: Checking out the contributions of researchers to the event of cell theory and the knowledge of existence within the cellular stage.
Ileum has quite a few villi which further causes the area place to boost therefore growing the amount of absorption of digested foodstuff.
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Take note: The above mentioned useful may be performed within an experiential method as opposed to recording observations.
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Remedy: Mendeleev utilised atomic pounds as the basis of classification of elements in the periodic desk. He did stay with it and classify things into groups and durations.
(e) Defaecation — The expulsion of undigested remains of meals in the alimentary canal is termed defaecation.
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Answer: Within a multielectron atom, the electrons current during the inner shells defend the electrons during the valence shell from your attraction with the nucleus or they work as a screen among the nucleus and these electrons.
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Dilemma two. Apart from tetrahedral geometry, An additional achievable geometry for CH4 is square planar Along with the four H atoms on the comers in the square plus the C atoms at its centre. Describe why CH4 isn't sq. planar?