Pure substance element I think
Thermal energy transfers in a solid state, due to convection, in metalic substances.
This is because the covalent bonds between the atoms are being broken and reformed again while the metal is experiencing stress. <em>covalent bonds store energy. </em>
Both carbon and lead belong to Group IV elements, and thus they have the same number of valence electrons.
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each of the other options, the two elements belong to different groups,
and thus they do NOT have the same number of valence electrons.
I hope this helped you, please tell me if I am correct or not <3
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Answer for your question is;
2,6 = 8
The first shell is 2 electrons the other shell is 6 electrons
