I count 19 electrons. That is potassium. You need to learn how to read a Periodic Table.
Unable to answer this question as you have omitted the third energy shell.
This element is calcium.
Argon
Potassium
S
This shows 19 electrons, with 4s1 as a valence electron. This is potassium (K).
1s22s22p63s23p64s1 or [Ar]4s1
Neither K2+ nor K2+ exist but even a putative configuration is impossible without knowing what one you mean.
[He] 2S2 is the noble gas electron configuration for beryllium.
The electron configuration of the element with the atomic number 39 (yttrium) is: [Kr]4d15s2.
The electron configuration for a ground-state potassium atom is 1s22s22p63s23p64s1. The noble gas shorthand configuration is [Ar]4s1.
This shows 19 electrons, with 4s1 as a valence electron. This is potassium (K).
1s22s22p63s23p64s1 or [Ar]4s1
Neither K2+ nor K2+ exist but even a putative configuration is impossible without knowing what one you mean.
[He] 2S2 is the noble gas electron configuration for beryllium.
The element is Argon. Its configuration is 2 8 8.
The electron configuration of the element with the atomic number 39 (yttrium) is: [Kr]4d15s2.
Sodium has the configuration Ne 3s2 . Sodium is group-1 element.
The element sulfur (element number 16) has an orbital configuration of 1s2 2s2 2p6 3s2 3p4.
Beryllium would have that configuration
The element with that electron configuration is Iron.
the element is tungsten with the electronic configuration Xe 4f14 5d4 6s2