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Q. How to evaluate mass number?
An isotope of an element is recognized by its mass number which is the sum of the number of protons and neutrons in the atom's nucleus.
Mass number = number of protons + number of neutrons
When texting the symbol for an isotope write the atomic number and mass number as shown in the following examples.
H atom with one proton and no electrons H atom with one proton and one neutron
why lithium is the strongest reducing agent in alkali metals
The four quantum numbers of the valence electron of potassium are : (1) 4, 1, 0 and 1/2 (2) 4, 0, 1 and 1/2 (3) 4, 0, 0 and +1/2 (4) 4, 1, 1 and 1/
For the n= 2 energy level, how many orbitals of all kinds are possible: (1) 2 (2) 3 (3) 4 (4) 5 Ans: 4
For a hydrogen atom, calculate the wavelength (in nm) of an emitted photon in the Lyman series that results from the transition n = 3 to n = 1
Q. Name of the reagent required for determination of hardness of water sample of complex metric method. Briefly give the function of each reagent used. Ans. Reagents requir
what are the topics which are covered under the assignment of de broglie hypothesis?
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Solid Nacl is a bad conductor of electricity since: (1) In solid Nacl there are no ions (2) Nacl Solid is covalent (3) In solid Nacl there is no motion of ions
Q. What do you understand by dissolved oxygen in water? How does it create trouble in boiler? Give chemical methods with suitable reactions to remove it from the water. Ans.
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