railway RRB Technician Grade 3 Mock Test 2024 General Science Chemistry

ಆವರ್ತಕ ಕೋಷ್ಟಕದಲ್ಲಿನ ಮೊದಲ ಧಾತು ಯಾವುದು?

1
ಹೀಲಿಯಂ
2
ಆಮ್ಲಜನಕ
3
ಹೈಡ್ರೋಜನ್
4
ನಿಯಾನ್
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