Use The Periodic Table To Identify The Number Of Core Electrons And The Number Of Valence Electrons In Each Case Below., Potassium (K): 1s22s22p63s23p
Use the periodic table to identify the number of core electrons and the number of valence electrons in each case below.
Potassium (K): 1s22s22p63s23p64s1
core electrons
valence electrons
Potassium (K) has :
- core electrons : 18
- valence electron : 1
Further explanation
Valence electrons are electrons used in forming bonds and are in the outer shell of an element.
The main group elements usually use electrons in the subshell ns and np
While the transition elements in the subshell (n-1) d
The location of the elemental groups in the periodic system is determined by the number of valence electrons in the last sub-shell
The period of an element is determined from the valence shell (the biggest main quantum number (n))
Core electrons are electrons that belong to atoms except for valence electrons. It is located close to the core and fills the inner shell.
Electron configurations from K :Ar 4s¹ or 1s²2s²2p⁶3s²3p⁶4s¹
From this electron configuration , number of electron = 19, and the atomic number shows the number of protons = the number of electrons (in neutral neutrals),
The electron configuration shows that the valence electron of the K atom is 1, so the number of Core electrons:
Core electron = atomic number (total number of electrons) - valence electron
Core electron = 19 - 1
Core electron = 18
Learn more
Periodic systems
Element Name (Symbol) and Atomic Number
the Latin name of the elements in the periodic table
the horizontal rows of elements
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