Chemistry Metals and Non-metals CBSE Board 2025 Medium
An element ‘M’ has 25% of the electrons filled in the third shell as in the second shell. The element ‘M’ is:
An element ‘M’ has 25% of the electrons filled in the third shell as in the second shell. The element ‘M’ is :
- (a)Sodium
- (b)Magnesium
- (c)Aluminium
- (d)Calcium
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