how you justify the presence of 18 elements inthe 5 period of the periodic table
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For fifth period quantum number n=5 the values of azimuthal quantum number =l 0,1,2,3
Now filling the orbitals in sub shell takes place in order of increasing energy of the sub shell. Since, energy of 4f sub shell. Is higher than 5s sub shells available for filling are 5s, 4d, 5p
Total number of orbitals =1 for 5s + 5 for 4d + 3 for 5p
=1+5+3
=9
Now filling the orbitals in sub shell takes place in order of increasing energy of the sub shell. Since, energy of 4f sub shell. Is higher than 5s sub shells available for filling are 5s, 4d, 5p
Total number of orbitals =1 for 5s + 5 for 4d + 3 for 5p
=1+5+3
=9
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