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Get Answers to all your Questions
10.2 Discuss the general characteristics and gradation in properties of alkaline earth metals
Answers (1)
The general characteristics and gradation in properties of alkaline earth metals-
- General electronic configuration is [noble gas]
.
- Have two electrons to lose and attain their nearest noble gas configuration.
- have smaller atomic and ionic radii than corresponding alkali metals in the same periods.
- First IE is higher than those elements of group 1
- electropositive nature increase down the group from Be to Ba.
- they give a positive flame test by imparting different colours.(except Be and Mg)
Chemical properties-
- Be and Mg are inert to oxygen and water. this is because of the formation of a thin layer of oxide on their surface.(powdered Be give BeO and
.
- React with halogens at high temperature to form halogen halides.
here M = alkaline metals and X = halogen elements
- All alkaline metals react with hydrogen and form hydrides except for Beryllium
- React with acids to form salts and produce dihydrogen gas.
- Act as a reducing agent but not as powerful as alkali metals. Down the group reducing power decreases.
- Also, dissolve in liquid ammonia and give the deep blue coloured solution.
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