Helium and element 'X' have outer electron configuration of ns2. Identify the element 'X'.
This question was previously asked in
Shift 23/05/2023 3:30 PM - 6:30 PM
A
Na
B
B
C
Be
D
Ne
Correct Answer
Be
Detailed Explanation
3. Be
- Na (Sodium) - outer electron configuration: 3s1
- B (Boron) - outer electron configuration: 2s2,2p1
- Be (Beryllium) - outer electron configuration: 2s2
- Ne (Neon) - outer electron configuration: 2s2,2p6
Among these options, only Beryllium (Be) has the outer electron configuration of ns² (2s2), matching the given configuration
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