railway RRB Group D Mock Test Series 2024-25 General Science Chemistry Classification of Elements and Periodicity in Properties

આધુનિક સામયિક કાયદો કોણે રજૂ કર્યો હતો?

1
મોસેલી
2
લોથર મેયર
3
મેન્ડેલીવ
4
ડોબેરેનર
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