Question

1. Electronic configurations of four elements are given below: (a) 1s2 2s1 (b) 1s2 2s2 2p5 (c) 1s2 2s2 2p5 3s2 (d) 1s2 Justify that above examples are from following groups of elements: i) An alkali metal ii) An alkaline earth metal iii) A noble gas iv) A halogen⁶ ​

Answer 1

Answer:

a is alkali metal ,b is halogen ,c is alkaline earth metal ,d is nobel metal

Explanation:

in a one electron is in outermost cell while in b E7 electrons out are in outermost shell so a is alkali metals

while b is halogen in c outermost shell has 2 electrons so it is alkaline earth metal while d is noble gas because it has fully filled outermost cell