Question

दो तत्व a व b भी का परमाणु क्रमांक 19 व 13 है A व b आवर्त संख्या बताइए​

Answer 1

Answer:

The element has atomic number (Z=19) is potassium (K) and the element has atomic number (Z=13) is Aluminium (Al) so

a and b elements are potassium and aluminium respectively....