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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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