Question

Why Boron with atomic number 4 and Calcium with atomic number 20 are placed in group 2 what will be the atomic number of first and second elements in group 13

Answer 1

Hi there,

◇ The element that has atomic no 4 is beryllium (Be)

♤ First element in group [13] is

◇ Boron with atomic no 5 (B5),

and comes after it is

◇ aluminium with atomic no 13

(Al 13)

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