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Ask QuestionPosted by Anmol Nehra 5 years, 8 months ago
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Yogita Ingle 5 years, 8 months ago
H2O
The molecular mass of water, H2O
= (2 × Atomic mass of hydrogen) + (1 × Atomic mass of oxygen)
= [2(1.0079) + 1(16.00)]
= 2.016 + 16.00
= 18.016
Approximate the value
= 18.02 amu
Posted by Priya Joshi 5 years, 8 months ago
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- Atomic hypothesis was given by many scientists. According to which everything in this universe is made up of atoms.
- Atoms are little particles that move around in a perpetual order attracting each other when they are little distance apart.
- But if they are forced very close to each other then they rebel.
- For example: - Consider a block of gold. It consists of molecules which are constantly moving.
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Electronic Configuration of Lanthanides
Lanthanides of first f-block have a terminal electronic configuration of [Xe] 4f1-14 5d 0-16s2 of the fourteen lanthanides, promethium (Pm) with atomic number 61 is the only synthetic radioactive element. The energy of 4f and 5d electrons are almost close to each other and so 5d orbital remains vacant and the electrons enter into the 4f orbital.
Exceptions are in the case of gadolinium, Gd (Z = 64) where the electron enters the 5d orbital due to the presence of half-filled d-orbital and lutetium (Z = 71) enters the 5d orbital.
Electronic Configuration of Actinides
Actinides are the second series of elements of the f-block having a terminal electronic configuration of [Rn] 5f1-14 6d 0-17s2. The energy of 5f and 6d electrons are close to each other and so electrons enter into the 5f orbital.
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Electrochemistry is a branch of chemistry that deals with the interaction between electrical energy and chemical energy. It is broadly divided into two categories:
- Production of chemical change by electrical energy i.e. the phenomenon of electrolysis
- Conversion of chemical energy into electrical energy. i.e., the generation of electricity by spontaneous redox reactions.
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This SI unit is used to measure the luminous intensity of a light source which is moving in a specific direction. It is also sometimes referred to as candle and represented as cd / m 2.
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RULES OF WRITING ELECTRONIC CONFIGURATION:
“It is the number of electrons in different orbitals. “
There are certain set of rules that are followed:
Aufbau principle: It states that in ground state of atom, the orbitals are filled in order of their increasing energies. That is electrons first occupy the lower energy orbital then higher energy orbitals are filled.
According to it:
- The lower the value of n+l for an orbital, the lower is its energy and is filled first.
For example: Out of 2s and 2p ,2s is filled first as n+l for 2s, is 2+0=2 and for 2p it is 2+1=3. Therefore, 2s is filled first.
- If two orbitals have same value of n+l , than the orbital with lower value of n is filled first.
For example: Out of 3p and 4s, n+l for both is 4 . Therefore, 3p is filled first as it possess lesser value of n.
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