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Ask QuestionPosted by Aadya Singh 5 years, 1 month ago
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Posted by Aadya Singh 5 years, 1 month ago
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Gaurav Seth 5 years, 1 month ago
The position of d-block elements is in between the s-block and p-block elements in the periodic table. These d-block elements are called transition elements because they exhibit transitional behaviour between s-block and p-block elements. Their properties are transitional between highly reactive metallic elements of s-block which are typically ionic compounds and the elements of p-block which are largely covalent.
Posted by Aadya Singh 5 years, 1 month ago
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Gaurav Seth 5 years, 1 month ago
The Electronic configuration of Cr and Cu are given below ⇒
1. Cr = 24 = 1s² 2s² 2p⁶ 3s² 4p⁶ 4s¹ 3d⁵
2. Cu = 29 = 1s² 2s² 2p⁶ 3s² 4p⁶ 4s¹ 3d¹⁰
These electronic configuration are exceptional because electrons entered in 3-d orbitals without filling the 4s orbitals complete.
Reason for the Exceptions ⇒ It is said that d orbitals can be stable if it is half filled or full filled.
Thus, In the given case, electrons reaches near the half filled and full filled thus due to the attraction one electrons from the s orbitals came in d orbitals.
Posted by Pk ⚔️ 5 years, 1 month ago
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Gaurav Seth 5 years, 1 month ago
It is defined as the fraction (or percentage) of the total salt which is hydrolysed at equilibrium. For example, if 90% of a salt solution is hydrolysed, its degree of hydrolysis is 0.90 or as 90%. It is generally represented by ‘
’.
Salts of strong acids and strong bases do not undergo hydrolysis (they undergo only ionization) hence the resulting aqueous solution is neutral.
Posted by Azra Parveen Parveen 5 years, 1 month ago
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Yogita Ingle 5 years, 1 month ago
Electron gain enthalpy of an element is the energy released when a neutral isolated gaseous atom accepts an extra electron to form the gaseous negative Ion i.e. anion. We can denote it by Δ egH. Greater the amount of energy released in the above process, higher is the electron gain enthalpy of the element.
- Energy is released when an electron is added to the atom. Therefore, the electron gain enthalpy is negative.
- The electron gain enthalpy for halogens is highly negative because they can acquire the nearest stable noble gas configuration by accepting an extra electron.
- Noble gases have large positive electron gain enthalpy. This is because the extra electron is placed in the next higher principal quantum energy levels. Thus, a highly unstable electronic configuration is produced.
Dεερακ Ȿιηɠꜧ 5 years, 1 month ago
Posted by Aarti Padhiyar 5 years, 1 month ago
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Yogita Ingle 5 years, 1 month ago
The force of attraction existing between hydrogen atom which is attached to highly electronegative atom in a covalent molecule and more electronegative atom of another covalent molecule is called hydrogen bonding.
Hydrogen bond is possible mostly in polar covalent molecules where partial charge separation is there.
As this bond existed between partial charges, it is considered to be weak bond than ionic and covalent bonds.
Ex: Hydrogen bond present in HF molecule.
Posted by Aadya Singh 5 years, 1 month ago
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Dεερακ Ȿιηɠꜧ 5 years, 1 month ago
1s<2s<2p<3s<3p<4s<3d<4p<5s<4d
Consept:
Find n+l,
if two (n+l) become same then choose the orbital whose 'n' is lowest to find the lower energy orbital,
That's all ....
Azra Parveen Parveen 5 years, 1 month ago
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Dark ..? 5 years, 1 month ago
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?Ritesh Gupta? 5 years, 1 month ago
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Yogita Ingle 5 years, 1 month ago
In 1878 William Crooks carried out discharge tube experiments and discovered new radiations and called them cathode rays. Since these rays travel from the cathode towards anode. Later, J.J Thomson studied the characteristics of cathode rays and concluded that cathode rays are negatively charged particles, now called electrons. The name electron was given by Johnson Stoney.
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Shadow Eye 5 years, 1 month ago
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Shadow Eye 5 years, 1 month ago
Yogita Ingle 5 years, 1 month ago
Stereochemistry is the systematic presentation of a specific field of science and technology traditionally requires a short preliminary excursion into history. Stereochemistry is the ‘chemistry of space ‘, that is stereochemistry deals with the spatial arrangements of atoms and groups in a molecule.
Pk ⚔️ 5 years, 1 month ago
Posted by Pk ⚔️ 5 years, 1 month ago
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Yogita Ingle 5 years, 1 month ago
Buffer solution
They are those solutions which has a constant value of pH , no matter what we add in to them .
Example: The pH of Blood is 7.4-7.6. Blood act as a buffer. As u all know, in spite of eating so many types of food items, the pH of blood remains same.
The buffer solution is defined as: A solution which resists the change in hydrogen ion concentration on addition of a small amount of acid or a base in to it.
Jinu ?? 5 years, 1 month ago
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Posted by Nitin Yadav 5 years, 1 month ago
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Yogita Ingle 5 years, 1 month ago
Resonance
It is given by Heisenberg.
He took a molecule of ozone. Its structure was represented as:
According to the structure, it is clearly seen that it has one double bond and another single bond. So, obviously the bond lengths will be different. For double bond between oxygen atoms, the bond length is 121pm and for single bond it is 148pm.
But, the bond length was found experimentally to be same for both the bonds that is 128pm .This bond length lies in between the values of single and double bond lengths.
Posted by Namit K 5 years, 1 month ago
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Shadow Eye 5 years, 1 month ago
Yogita Ingle 5 years, 1 month ago
Hydrogen bonding refers to the formation of Hydrogen bonds, which are a special class of attractive intermolecular forces that arise due to the dipole-dipole interaction between a hydrogen atom that is bonded to a highly electronegative atom and another highly electronegative atom while lies in the vicinity of the hydrogen atom. For example, in water molecules (H2O), hydrogen is covalently bonded to the more electronegative oxygen atom. Therefore, hydrogen bonding arises in water molecules due to the dipole-dipole interactions between the hydrogen atom of one water molecule and the oxygen atom of another H2O molecule.
Nitin Yadav 5 years, 1 month ago
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Dεερακ Ȿιηɠꜧ 5 years, 1 month ago
:)
Muskan Singh 5 years, 1 month ago
Muskan Singh 5 years, 1 month ago
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