Question

describe moslays classification
​

Answer 1

Answer:

(i) Each period starts with an alkali metal whose outermost electronic configuration is ns1.

(ii) Each period ends with a noble gas of outermost electronic configuration ns2np6 except He. The electronic configuration of He is 1s2.

(iii) The number of elements in a period is equal to the number of necessary electrons to acquire ns2np6 configuration in the outermost shell of first element (alkali metal) of the period. First period contains two elements.

(iv) The number of elements in each period may be determined by the number of electrons in a stable configuration as under