لیا۔
why is lithum with atomic number
3. and potessium with atomia
number 19 are
placed in group
one. what will be atomic number
of the first two element is the secobd
group
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lithium electronic confi is 2,1 and pottassium is 2,8,8,1 i.e they both have same valency and place of element in a group is decide by its valence elctrons as they hav valency 1 they ar placed in group 1 .
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