The Noble gas notation for Krypton can be written as [Kr] because it is a Noble gas or [Ar]4s2 3d10 4p6.
Potassium (K) has an atomic number of 19. The noble gas electron configuration is [Ar]4s^1
The electron configuration of ptassium is [Ar]4s1.
It is 2,8.8,1 or [Ar],1.
[Ar]4s1
[Ar] 4s1
argon atom
If this is from study island, which I assume it is, I just got this question and the answer is Potassium (K)
4
It accepts one electron.
The full electron configuration for sulfur atom is 1s2.2s2.2p6.3s2.3p4.
The electron configuration for a ground-state potassium atom is 1s22s22p63s23p64s1. The noble gas shorthand configuration is [Ar]4s1.
A potassium atom "always" loses exactly one valence electron when it reacts with another element, because one valence electron in a potassium atom has a much lower ionization energy requirement than any other electron in the same atom. (This property is generally ascribed to the fact that when a potassium loses exactly one electron, it acquires the very stable electron configuration of the noble gas argon.) A chlorine atom has a very strong attraction (its electronegativity) for exactly one electron, which gives the charged atom the electron configuration of an argon atom. Therefore, when a potassium atom is close enough to a chlorine atom, one electron is transferred between to form an ionic bond and a formula unit of the compound potassium chloride.
argon atom
Fluorine attains the electron configuration of neon (the nearest noble gas).
If this is from study island, which I assume it is, I just got this question and the answer is Potassium (K)
[Ar] 4s2
It accepts one electron.
4
Definition: A noble gas core is an abbreviation in an atom's electron configuration where the previous noble gas's electron configuration is replaced with the noble gas's element symbol in brackets. ... This is the noble gas core notation of sodium.
Every halogen has the capacity to accept one electron from a sodium atom and to thereby achieve a noble gas electron configuration of eight valance electrons. The halogens are fluorine, chlorine, bromine, iodine, and astatine.
An atom of silicon needs to gain 4 electrons in its 3p sublevel to attain the noble gas electron configuration of argon, the noble gas in period 3 of the periodic table.
"Noble gas configuration" means that in writing out an electron configuration for an atom, rather than writing out the occupation of each and every orbital specifically, you instead lump all of the core electrons together and designate it with the symbol of the corresponding noble gas on the Periodic Table (in brackets). For example, the noble gas configuration of nitrogen is [He]2s22p3