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The sodium atom loses an electron to chlorine. Chlorine has a higher electronegativity so it attracts the electron from sodium. Sodium now has 11 positive protons holding only 10 electrons whereas chlorine has an extra electron to control. Chlorine has 17 protons holding 18 negative electrons, therefore, its proton to electron ratio has gone down. Sodium's proton to electron ratio went up, therefore, the electrons are closer to the nucleus and the ionic radius is less than the atomic radius.

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Q: Why is the sodium atom smaller than the chlorine atom in a salt molcule?
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Related questions

When an atom of chlorine forms an ionic bond with an atom of sodium does the atom of chlorine become an ion with a smaller or larger radius than the atom of chlorine?

It becomes an ion with a larger radius than the atom of chlorine


What kinds of bonds occurs when an atom of sodium joins an atom of chlorine to form sodium chlorine?

Sodium chloride has ionic bonds.


When an electrom is transferred from sodium atom to a chlorine atom the chlorine atom becomes?

Chlorine becomes negatively charged.


Is sodium and chlorine a pair of isotopes?

Sodium and chlorine are elements. If you mean one sodium atom and one chlorine atom yes they would be both isotopes but of different elemnts. If they were randomly sampled from nature the sodium atom would almost certainly be sodium-23 (there is only a trace of sodium-22 found in nature) and the chlorine atom would most likely be chlorine-35 as this isotope is about 75% of chlorine)


When sodium forms an ionic bond with chlorine the sodium atom donates an electron to chlorine and becomes a 19 charged ion?

No! A sodium atom is initially electrically neutral. When it donates one electron to a chlorine atom, the sodium atom becomes a singly charged cation.


What kinds of ions do a sodium atom and a chlorine atom become when a valence electron is transferred from one the the other?

The sodium atom becomes a sodium cation, and the chlorine atom becomes a chloride anion.


How are sodium and chlorine ions different from salt molecules?

A sodium ion is a sodium atom missing one electron. A chlorine ion is a chlorine atom with an extra electron. A salt molecule is a sodium ion stuck to a chlorine ion.


Which atom in sodium chloride is reduced?

The chlorine atom.


Describe how a sodium atom form a bond with a chlorine atom?

The bonding mechanism between sodium and chlorine atom occurs through harpoon mechanism


Is table salt made of two atoms of sodium and one atom of chlorine or one atom of sodium and one atom of chlorine or two atoms of sodium an two atoms of chlorine?

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If chlorine atom were to attract an electron from sodium the chlorine atom would become a?

positively


When a electron is transferred from a sodium atom to a chlorine atom the chlorine atom becomes?

they form an ionic bond (: