IMore violently Nate emental calcium. Which of the following best explains this dif- ference in reactivity? (i) Calcium has greater metallic character than does barium. (ii) The electron affinity of calcium is smaller than that of barium. (iii) The first and second ionization en- ergies of barium are less than those of calcium. (iv) The atomic radius of barium is smaller than that of calcium. (v) The ionic radius of the barium ion is larger than that of the calcium ion.

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A: Given element is Boron , B Atomic number = 5 Electronic configyration : 1s22s22p1