Question

plz plz anyone answer it......uts vry urgent​

Answer 1

1. K

2.Ca

3.Be, Ca, Mg

4.Li

5.Atomic number of sodium is 11, it has following electronic configuration: 2(K) , 8(L) , 1(M) . Sodium atom donates one electron in its valence shell M, which results in disappearance of M shell and its L shell with eight electrons becomes new valence shell. Thus, it attains the stable electronic configuration of nearest noble gas neon.

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