Question

given below are some elements of the modern periodic table:-Be, F, Si ,K (i)select the element that has one electron in the outermost and write its electronic configuration (ii)select two elements that belong to the same give reason for your answer (iii)select two element that belong to the same period which of these two has bigger atomic size

Answer 1

1.K(potassium) has one electron in valence shell. Its configuration is 2,8,8,1.
2 PLEASE CHECK YOUR QUESTION AGAIN. YOU HAVEN'T MENTIONED SOMETHING.
3 Be and F are in same period. Be has bigger atomic size