Sodium chloride is called
compound, why?
The valency of neon is zero but that of sodium is one, why?
The elements of group 1 are reactive but those of group 18 are inert, why?
Electrovalent compounds are electrolysed but covalent compounds are not
why?
Identify electropositive and electronegative radicals from the following:
1) Sulphate
ii) Ammonium iii) Nitrate iv) Carbonate
Group-C
What is a chemical bond? How is it formed? Write with an example.
How is covalent bond formed? Write in brief.
Calculate the maximum number of electrons present in shell L and N by
in the formation of sodium diloride with a neat figure
Answers
Answer:
Explanation:
Something like table salt (NaCl) is a compound because it is made from more than one kind of element (sodium and chlorine), but it is not a molecule because the bond that holds NaCl together is an ionic bond. If you like, you can say that sodium chloride is an ionic compound.
Valency is zero, being a noble gas, does not react because of that fact. Answer: valency of neon is 0 because it has completely filled valence{outermost} shell i.e. 8 electrons and so it is stable
The noble gases (Group 18) are located in the far right of the periodic table and were previously referred to as the "inert gases" due to the fact that their filled valence shells (octets) make them extremely nonreactive. The noble gases were characterized relatively late compared to other element groups.
Because electrovalent compounds contains electron and ion where as covalent compounds does not contains ion or electrons..
Ammonium is your Answer
Ionic bonds are typically formed between one metallic and one nonmetallic atom. Sodium chloride, or NaCl, is an example of an ionic bond. Another example of an ionic bond is found in lithium fluoride (LiF). Lithium has one electron in its outer shell, and fluorine has seven electrons in its outer shell.
Bond formation in Sodium Chloride (NaCl)
NaCl is an ionic solid.
The general electronic configurations are...
Na−1S
2
2S
2
2P
6
3S
1
Cr−1S
2
2S
2
2P
6
3S
2
3P
5
Na is in excess of one electron to attain octet configuration.
Cl has one electron less to attain octet configuration.
So, the excess one electron is transferred to a chlorine atom from Na(sodium) atom and thus an ionic bond is formed due to the transfer of electrons. Chloride being a mole electronegative atom than sodium tends to attract the shared electron pair towards itself.
Thus NaCl has Na
+
and Cl
−
atoms.
Na
+
−Cl
−
Chloride attains octet configuration by gaining on the electron.
Sodium attains octet configuration by losing the electron.
Thus Ionic solid NaCl is stable.
Explanation:
X=2,8=10: It is the electronic configuration of neon.
Y=2,8,7=17: It is the configuration of the halogen family of chlorine atom which is non-metal
Z=2,8,2=12: It is the configuration of alkaline earth metals of magnesium atom which is metal.
Therefore, X is a noble gas, Y is a non-metal, and Z is a metal.
Option D is correct.