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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
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 ?
1.If the number of molecules in a given sample of SO2 is 3.011 x10 23
Calculate the following:
a) Number of moles in the given sample
b) Mass of SO2 in the sample
c) Number of oxygen atoms in the sample
the properties of electrons, protons and neutrons.
The charge/mass ratio of electron
a) depends upon nature of gas
b) depends upon nature of electrodes
c) remains constant
d) depends upon both nature of gas and nature of electrodes
what are the application of isotopes
what is the difference between sodium ion and sodium atom ?
What are the drawbacks of Rutherfords atomic model?
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 ?
which has highest e/m ratio
a) he 2+
difference between electrons protons and neutrons...also find the relation between the three
Who discovered proton? Golstein or Rutherford?
explain the rutherford's gold foil experiment with the help of diagram?
Q1 Tabulate name of elements,their latin names and symbols.
what is electrovalency and covalency
(a) What are isobars? Give one example. (b) Write any two uses of isotopes
Write two differences between isobars and isotopes.
discrete orbits are also known as_____
why is the valency of phosphorus 3 & 5 both ?
6. which observation of rutherfords scattering experiment established the presence large empty space in atom?
How to learn the 30 elements of modern periodic table Quickly?
What is the maximum number of energy levels in an atom?
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.
Why is a alpha particle called helium nucleus?
What is the valency of Aluminium whose atomic number is 13 ? Give reason.
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.
While revolving in discrete orbits, the electrons do not radiate energy. Could it be explained with proper reason with the help of video?
what are properties of anode rays x rays cathode rays and alpha particles
wht r d drawbacks of bohr's model of an atom??
Give 6 examples of isobars .........
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
What happens when an electron jumps from lower to higher energy levels?
State 3 characteristics of canal rays.
what would be the electronic configuration fm Na+,Al3+,O2-,Cl-
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
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.
State two main postulates of Thomson model of an atom
applications and examples of isotopes an isobars ?
what is the valency of silicon ? is it positive or negative ? is it a metal or non-metal or a metalloid ?
what is difference between Isotopes, Isobars and Isotones
give the atomic masses of important element for class 9
IF Z=13,WHAT WOULD BE THE VALENCY OF THE ELEMENT ? ALSO, NAME THE ELEMENT?
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.
difference between isotope and isobars
is it possibe for the atom of an element to have one electron one proton and no neutron?if so name the element
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
who discovered the proton? E. goldstein or rutherford?
ARE ELECTRONS , PROTONS AND NEUTRONS FURTHER DIVIDED INTO SOMETHING?
Z = 3, what would be the valency of the element? Also, name
the following data represents the distribution of electrons ,protons and neutrons in atoms of four elements A, B, C, D.
ELEMENTS PROTONS NEUTRONS ELECTRONS
A 19 21 19
B 17 18 17
C 17 20 17
D 18 22 18
Answer the following:
1. describe the electronic distribution in atom of element B.
2. is element B a metal or non-metal? why?
write three significant features of Bohr's model of an atom.
In the Thomson's model of atom,which of the following statements are correct ?
1) the mass of the atom is assumed to be uniformly distributed over the atom
2) the (+) ve charge is assumed to be uniformly distributed over the atom
3) the e-s are uniformly distributed in the positively charged sphere
4) the e- s attract each other to stabilize the atom.
a) 1, 2 and 3 b) 1 and 3 c) 1 and 4 d) 1, 3 and 4
Name three feature of rutherford's model
from the symbol 32S16 state:-
i)atomic number of sulphur
ii) mass number of sulphur
iii) electronic configuration of sulphur.
what are cathode rays and anode rays?
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