Question

Which of the two elements given below would be chemically more reactive A is 20 and B is 18

Answer 1

metal b because metal a is stable and

Answer 2

element B has atomic number 18. in the k shell there will be 2 electrons. in the L shell there are 8 electrons and in the last shell..it has again, 8 electrons. this means its octet is complete. hence it will be unreactive. whereas the element A Will have 2 valence electrons. so A will be more reactive.