HEYA MATE.....kartik here
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a. atomic number is 4
therefore it is, beryllium
b. atomic number is 15
therefore it is, phosphorus
c. atomic number is 21
therefore it is, scandium
therefore it is, beryllium
b. atomic number is 15
therefore it is, phosphorus
c. atomic number is 21
therefore it is, scandium
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1) berryllium
2) phosphorus
3) scandium
2) phosphorus
3) scandium
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