The two elements, in looking at their atoms, have a total of 51 protons between them are Magnesium and Aluminum and Lithium and Scandium so option d. both A and B.
What are protons?
The protons are + charges particles found in the nucleus of the atoms.
NO. of protons in :
- Magnesium and Aluminum- Magnesium has total of 12 proton and Aluminum has 13 total protons.
- Lithium and Scandium- Lithium has 3 and Scandium has 21
So total no. of protons= 12+13+3+21= 50.
Thus it lies in between total of 51 protons in the periodic table.
To read about Lithium refer link :
https://brainly.com/question/20792570
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