Question

define atomic mass unit state how the atomic number exist give the electron electrical configuration of element with the alternate number 38 12 and 13

Answer 1

38=2,8,8,18,2
12=2,8,2
13=2,8,3
atomic mass unit is the mass of atom compared to the carbon 12
atomic number is the number of electron in it so that thats why

Answer 2

Define atomic mass unit. ... Atomic mass unit (amu) is defined as the mass unit equal to exactly 1/12th of the mass of one atom of C-12 isotope. Atom may exists independently in free state (e.g. He, Ne and Ar) or in combined state.

12 Mg magnesium : [Ne] 3s2

1s2 2s2 2p6 3s2                      

2 8 2      

13 Al aluminium : [Ne] 3s2 3p1

1s2 2s2 2p6 3s2 3p1                      

2 8 3  

32 Ge germanium : [Ar] 3d10 4s2 4p2

1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p2                  

2 8 18 4