Chemistry · Periodic Table
बाएं से दाएं बढ़ते हुए परमाणु क्रमांक के अनुसार निम्नलिखित में से कौन सा युग्म सही है?
- 1Ca, Cl
- 2Be, B✓
- 3Na, Ne
- 4He, H
सही उत्तर देखें
Be, B
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