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In a metallic bond, why positive ions are called kernels, not cations?

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The kernel is an atom without its valence electrons that are weakly bonded; no electron belongs to one nucleus, valence electrons can move one kernel to another. So it is known as kernel, not cation (have valency).
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Research scholar and teacher with over 6 years of experience.

The answer to this question is more about the syntactical meaning of the word 'kernel' than the technical meaning.There are many theories related to metallic bonding, one of them, called the 'electron sea theory', uses this term: kernel. If we see what kernel means in a non-scientific sense, it refers...
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The answer to this question is more about the syntactical meaning of the word 'kernel' than the technical meaning.
There are many theories related to metallic bonding, one of them, called the 'electron sea theory', uses this term: kernel. If we see what kernel means in a non-scientific sense, it refers to the central part of a nut/seed. Using the same reference, we can use it for the metal cations when talking in the context of 'electron sea theory'. This refers to the part of each metal atom except the free electrons. You can call it a 'core' as well, and to some extent, you'd be right.
Now the question which remains is whether or not we can call these parts simply 'cations'. I answer this with another question: Why not? After all, these are (in this context) ions with positive charges, and that's what categorizes them under the definition of the term 'cations'.
I hope that helps.

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Kernels are also known as atoms not having valence.
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Pursuing MBBS(Medicinae Baccalaureus Baccalaureus Chirurgiae)

Positive ions are called kernels, not cations because the cations are not fixed, and delocalised cations are called kernels.
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Chemical Engineer with 11 years of Teaching Experience at Engineering College

The dictionary meaning of Kernel is "the central or most important part of something". As you see in the above image, the positive ions are surrounded by the electrons, which are negatively charged. Here the positive ions or anions are at the centre, and valence electrons are outside. Therefore, positive...
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The dictionary meaning of Kernel is "the central or most important part of something". 

As you see in the above image, the positive ions are surrounded by the electrons, which are negatively charged. Here the positive ions or anions are at the centre, and valence electrons are outside. Therefore, positive ions are called Kernels and not cations.

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Tutor

Kernal is a term used for metal ions produced due to the delocalization of the electron in the crystal lattice.
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Chemistry teacher with 6 years of competitive exams training for class 11, 12th and M.Sc.(NET)

Cations are positively charged ions formed due to the loss of electrons from an atom. Kernels are not charged atoms. They are simply atoms with inner shell electrons and a nucleus.
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Enthusiastic Teacher with 10 years of experience

Metal atoms have fewer valence electrons, so they have many vacant valence orbitals; the metals ions produced due to delocalization are called kernels. The metal ions have a fixed position in the crystal lattice, while delocalized electrons can move in the crystal lattice.
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CHEMISTRY TEACHING PROFESSIONAL WITH 8 YEAR EXPERIENCE IN TEACHING

A kernel contains a positive charge and refers to an atom's nucleus and inner electrons (excluding the valence shell). The orbital of the valence shell overlaps with the orbital of another atom to form molecular orbitals in metallic bonding. Many of these orbitals develop, and valence electrons freely...
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A kernel contains a positive charge and refers to an atom's nucleus and inner electrons (excluding the valence shell). The orbital of the valence shell overlaps with the orbital of another atom to form molecular orbitals in metallic bonding. Many of these orbitals develop, and valence electrons freely flow across them, forming the SEA OF ELECTRONS. Although electrons are not permanently attached to an atom, they are still present. They have not been distributed. The valence electrons in a Cation are lost/given away to form a full octet/duplet.

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Kernel means nucleus, and the protons that lie in the nucleus thus are called kernels and not cations.
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