[Kr] 5s1
[He] 2s2 2p1
[Kr]4d105s25p3
[Kr]4d105s25p3
[Kr] 4d10 5s2 5p3
[Kr] 5s1
Sb (antimony) has 51 electrons. Its noble gas notation is [Kr] 4d10 5s2 5p3
[Ne]3s23p3
[He] 2s2 2p1
[Kr]4d105s25p3
[Kr]4d105s25p3
2.3!<-----wrong shorthand electron configuration for Boron (B on the periodic table) is [He] 2s2 2p1 because Shorthand means building on the last noble gas element. So put the closest Noble gas element before this one and then the new addition.
[Kr] 4d10 5s2 5p3
Sb (antimony) has 51 electrons. Its noble gas notation is [Kr] 4d10 5s2 5p3
[Xe] 4f14 5d2 6s2
The chemical symbol is As. The atomic number is 33.
[Xe] 4f14 5d10 6s2 6p2