Teaching UP B.Ed (Paper 1 & 2) Mock Test 2025 General Science Chemistry Periodic Table

द्वितीय आवर्तक के तत्वों के लिये प्रथम आयनन एन्थैल्पी का सही बढ़ता क्रम होगा :

1
Li < Be < B < C < N < O < F < Ne
2
Li < B < Be < C < O < N < F < Ne
3
Li < B < Be < C < N < O < F < Ne
4
Li < Be < B < C < O < N < F < Ne
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