The atomic number of 3 elements are A B and C are 9 10 and 13 respectively. Which of them will form a cations?

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Solution

Element C forms cation.
It has configuration of 2,8,3. That is it can lose its electron forming cation.
Other element A and B has configuration of 2,7 and 2,8. Element A forms anion and B is neutral.

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The atomic number of 3 elements are A B and C are 9 10 and 13 respectively. Which of them will form a cations?

Element C forms cation. It has configuration of 2,8,3. That is it can lose its electron forming cation. Other element A and B has configuration of 2,7 and 2,8. Element A forms anion and B is neutral.

Element C forms cation.
It has configuration of 2,8,3. That is it can lose its electron forming cation.
Other element A and B has configuration of 2,7 and 2,8. Element A forms anion and B is neutral.