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write 5-6 differences between isobars and isotopes in a tabular form .
what is the difference between sodium ion and sodium atom ?
how to find valency of an element?
Q :If number of electrons in an atom is 8 and number of protons is also 8, then (i) what is the atomic number of the atom and (ii) what is the charge on the atom?
ANS:(i) The atomic number is equal to the number of protons. Therefore, the atomic number of the atom is 8.
(ii) Since the number of both electrons and protons is equal, therefore, the charge on the atom is 0.
My Q: Why is the charge on the atom 0????
what were the drawbacks of thomson model of atom
Z = 3, what would be the valency of the element? Also, name
Calculate the number of molecules in 8g of Oxygen ?
if K and L shells of an atom ar full,then what would be the total number of electrons in an atom???
find the valency of sulphur .[atomic no.=16
Calculate the energy associated with photon of light having wavelength 6000 Angstrom . [ h = 6.624 x 10-27 erg - sec ]
Please help and explain .
what are canal rays ?
5 examples of isotopes and 5 examples of isobars
What is the valency of copper?
What happens when an electron jumps from lower to higher energy levels?
EXPLAIN THE LAW OF CONSERVATION OF MASS WITH AN EXAMPLE ?
the properties of electrons, protons and neutrons.
Chlorine has completely filled KL shells. Explain.
what are the application of isotopes
can someone give the answers plz...................
What are the drawbacks of Rutherfords atomic model?
how does photographic plate getaffected by alpha,beta and gamma rays ?
difference between electrons protons and neutrons...also find the relation between the three
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 ?
Who discovered proton? Golstein or Rutherford?
Calculate the no. of atoms of each element persent in 9.8 g of sulphuric acid, H2SO4. (H=1, S=32, O=16)
Q1 Tabulate name of elements,their latin names and symbols.
what is electrovalency and covalency
explain the rutherford's gold foil experiment with the help of diagram?
(a) What are isobars? Give one example. (b) Write any two uses of isotopes
Write two differences between isobars and isotopes.
why is the valency of phosphorus 3 & 5 both ?
discrete orbits are also known as_____
How to learn the 30 elements of modern periodic table Quickly?
what is the work done by an electron revolving ina circular orbit of radius "r" around a nucleus.
is it possibe for the atom of an element to have one electron one proton and no neutron?if so name the element
what r the rules of distribution of electrons in different shells of an atom.Pls give me all rules of higher classes also.
has completely filled K and L shells. Explain.
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.
Compare all the proposed models of an atom given in this chapter.
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
identify the isotopes out of A,B,C and D?
33A17 , 40B20 , 37C17 , 38D19
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
An atom 'M' of an element reacts with oxygen to form M2O3. Calculate the valency of element 'M'.
State 3 characteristics of canal rays.
State two main postulates of Thomson model of an atom
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
applications and examples of isotopes an isobars ?
What happens to an element Z if its atom gains 3 electrons?
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
how many molecules are present in
a) 9g of water
b) 17g of ammonium
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.
difference between isotope and isobars
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
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?
who discovered the proton? E. goldstein or rutherford?
write three significant features of Bohr's model of an atom.
Name three feature of rutherford's model
what are cathode rays and anode rays?
HOW CAN I CALCULATE VALENCY?
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