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write 5-6 differences between isobars and isotopes in a tabular form .
how to find valency of an element?
what were the drawbacks of thomson model of atom
what is the difference between sodium ion and sodium atom ?
Calculate the number of molecules in 8g of Oxygen ?
find the valency of sulphur .[atomic no.=16
what are canal rays ?
5 examples of isotopes and 5 examples of isobars
What is the valency of copper?
EXPLAIN THE LAW OF CONSERVATION OF MASS WITH AN EXAMPLE ?
if rutherford had taken beta particles instead of alpha particles in his model of atomic theorythen what would happen ?
the properties of electrons, protons and neutrons.
what are the application of isotopes
What are the drawbacks of Rutherfords atomic model?
is it possibe for the atom of an element to have one electron one proton and no neutron?if so name the element
Q.1. How many molecules are present in
(a) 9 grams of water
(b) 17 grams of amonia
Q.2. Calculate the number of moles in 17 grams of H2O2
Q.3. Show that 12 grams of carbon-12 contains 6.023 x 1023 atoms of 12C
Q.4. What is the mass of one atom of hydrogen ?
Q.5. How many moles of Mg atoms are there in 100 grams of magnesium ?
Q.6. Neon gas consist of single atoms. What mass of neon contains 6.023 x 1023 atoms ?
difference between electrons protons and neutrons...also find the relation between the three
to weight BaCl2 or Na2SO4
a) use a polythene bags and spring balance
b) use a watch glass and spring balance
c) use a polythene bags and physical balance
d) use a watch glass and physical balance
Who discovered proton? Golstein or Rutherford?
Why does Anode Rays depend on the nature of the gas present in the discharge tube ?
Q1 Tabulate name of elements,their latin names and symbols.
explain the rutherford's gold foil experiment with the help of diagram?
Chlorine has completely filled KL shells. Explain.
what is electrovalency and covalency
According to bohr's model of an atom, electron revolves around the nucleus in the fixed orbits called stationary states or energy shells. Electron does not emit nor absorb energy when it revolves. WHY IS IT SO?
Bohr argued that Rutherford's model would be highly unstable because according to him (bohr) if an electron revolves continously it would be subjected to accelaration. Thus, electron will continously emit radiation and fall in the nucleus. But when electron revolves around the nucleus in Bohr's model it also changes its energy shells, then why the bohr's model is not unstable?
(a) What are isobars? Give one example. (b) Write any two uses of isotopes
Write two differences between isobars and isotopes.
Z = 3, what would be the valency of the element? Also, name
why is the valency of phosphorus 3 & 5 both ?
What is gram atomic mass?
How to learn the 30 elements of modern periodic table Quickly?
1.Give the actual mass of electron and proton in kg?
Calculate the no. of atoms of each element persent in 9.8 g of sulphuric acid, H2SO4. (H=1, S=32, O=16)
what r the rules of distribution of electrons in different shells of an atom.Pls give me all rules of higher classes also.
what is electronic configuration of an element with atomic number - 27 and 28?
What is the valency of Aluminium whose atomic number is 13 ? Give reason.
how can the maximum number of electrons that can be accommodated in the outermost orbit is eight ????
what is the valency of gold, silver and lead and can you explai how we can find the valency of a compound like NH4, SO2, CO3 etc.
identify the isotopes out of A,B,C and D?
33A17 , 40B20 , 37C17 , 38D19
what are properties of anode rays x rays cathode rays and alpha particles
The nuclear radius is of the order of 10
-13 cm while atomic radius is of the order 10-8 cm. Assuming the nucleus and the atom to be spherical, what fraction of the atomic volume is occupied by the nucleus ?
wht r d drawbacks of bohr's model of an atom??
1) What is Archimedes principle? Describe an activity related to it.
2)What is buoyancy? Describe it with an activity.
3) Name the areas in which Archimedes principle is applicable.
Give 6 examples of isobars .........
Calculate the energy associated with photon of light having wavelength 6000 Angstrom . [ h = 6.624 x 10-27 erg - sec ]
Please help and explain .
valency of carbon in CH4 , C2H6 , C2H4 , C2H2 ???
discovery of electrons
Calculate the percentage of
[a] Water of crystallization in CuSO4.5H2O
[B] Potassium in K2CO3
[c] Oxygen in 22g of CO2
[D] Hydrogen in 36g of water
State 3 characteristics of canal rays.
Calculate number of neutrons present in 12 × 1025 atoms of oxygen (8O17). (Given NA = 6 × 1023 atoms)
(A) 1800 (B) 1600 (C) 1800 NA (D) 3200 NA
State two main postulates of Thomson model of an atom
applications and examples of isotopes an isobars ?
using the valency.find out following compound
carbon tetra chloride
the description of atomic particles of two elements X and Y is given below:
protons 8 8
neutrons 8 9
electrons 8 8
i) what is the atomic number of Y?
ii) what is the mass number of X?
iii) what is the relation between X and Y?
iv) which element/elements do they represent?
v) write the electronic configuration of X.
vi) write the cation/anion formed by the element.
what is difference between Isotopes, Isobars and Isotones
give the atomic masses of important element for class 9
an element X forms an oxide with formula X2O3
state the valency of X,write the formula of chloride of X and sulphate of X.
explain bohr model of an atom !?
difference between isotope and isobars
Why is the relative mass of electron is taken as negligible?
The electronic configuration of potassium(K) is 2,8,8,1 instead of 2,8,9 thogh the M shell can accommodate up to 18 electrons. Explain
Write any 5 characteristics of Canal Rays ?
who discovered the proton? E. goldstein or rutherford?
what are isotopes & isobars? Differentiate with examples
write three significant features of Bohr's model of an atom.
magnesium + oxygen= magnesium oxide
y oxygen is written o2
Name three feature of rutherford's model
what are cathode rays and anode rays?
1: What are noble gases, halogens, lanthanoids and actinoids?
2: What are isotopes, isobars and isomers ?
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