Argon is a neutral atom with atomic number of 18. It has an electron configuration of 2 electrons in the first energy level, 8 in the second, and 8 in the third, for a total of 18 electrons. Because there are equal numbers of protons in the nucleus and electrons it has no net charge.
Chlorine is a neutral atom with atomic number of 17. It has an electron configuration of 2 electrons in the first energy level, 8 in the second, and 7 in the third, for a total of 17 electrons.
But the third energy level can hold up to 8 electrons. So when chlorine gets one more electron to fill that third level, it becomes a chloride ion with a net charge of -1. This means it still has 17 protons in the nucleus (atomic number = number of protons) but now has a total of 18 electrons around the nucleus - just like argon its neighbor.
Excuse me, but a difference between these concepts is enormous, since that argon is a matter, and chloride is a сharged particle))
The major difference between chlorine and argon is that the later is a noble gas. Argon has 18 electrons and is a stable atom. Whereas chlorine has 17 electrons and thus has an affinaty to gain electron. therefore to complete it's outer shell it combines with elements of the first and second group by forming an ionic bond. Therefore chloride ion is highly reactive while argon is not even slightly reactive. Chlorine is also a strong oxidizing agent. It itself reduces and oxidizes the other compound or element.
a chloride ion and an argon atom are very different from each other.
firstly, chloride ion is a charged particle whereas argon atom is a neutral and stable atom.
secondly, as we know that the halogens like chlorine, bromine etc, form ionic bonds with the group 1 and group 2 elements. in these cases, the bond is formed by the transfer of an electron from an electropositive to electronegative species. This transfer is done carried out directly by the atoms. instead they first form ions, by either losing or gaining electrons and the these ions combine to form the ionic compounds. but argon does not form any ionic compound.
hence a chloride ion is very highly reactive, while the argon atom is negligibly reactive. so we got a difference in terms of chemical reactivity.
BUT WHAT IS DIFFERENCE BETWEEN THEIR PHYSICAL & CHEMICAL PROPERTIES ??? PLZ EXPLAIN ME IN DETAIL ...