railway RRB Technician Grade 3 Mock Test 2024 General Science Chemistry

આવર્ત કોષ્ટકમાં પ્રથમ તત્વ કયું છે?

1
હિલિયમ
2
ઓક્સિજન
3
હાઇડ્રોજન
4
નિયોન
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