For question number two statements are given- one labelled Assertion (A) and the other labelled Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below: a) Both A and R are true and R is correct explanation of the assertion. b) Both A and R are true but R is not the correct explanation of the assertion. c) A is true but R is false. d) A is false but R is true.
Assertion: Cathode rays consists of negatively charged particles, these are attracted towards anode (+ve terminal). Reason: Anode rays (canal rays) consists of positively charged particles and these are attracted towards cathode (-ve terminal).
write 5-6 differences between isobars and isotopes in a tabular form .
how to find valency of an element?
How is the Atomic mass of chlorine is 35.5u . As Atomic mass is sum of no. of protons and no. of neutrons.
what were the drawbacks of thomson model of atom
a) Both A and R are true and R is correct explanation of the assertion.
b) Both A and R are true but R is not the correct explanation of the assertion.
c) A is true but R is false.
d) A is false but R is true.
Reason: Anode rays (canal rays) consists of positively charged particles and these are attracted towards cathode
(-ve terminal).
Calculate the number of molecules in 8g of Oxygen ?
find the valency of sulphur .[atomic no.=16
what is the difference between sodium ion and sodium atom ?
what are canal rays ?
5 examples of isotopes and 5 examples of isobars
is it possibe for the atom of an element to have one electron one proton and no neutron?if so name the element
What is the valency of copper?
identify the isotopes out of A,B,C and D?
33A17 , 40B20 , 37C17 , 38D19
EXPLAIN THE LAW OF CONSERVATION OF MASS WITH AN EXAMPLE ?
on the basis of thomson's model of an atom explain how the atom is electrically neutral ?
Compare the properties of electrons, protons and neutrons.
what are the application of isotopes
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?
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 ?
difference between electrons protons and neutrons...also find the relation between the three
Calculate the no. of atoms of each element persent in 9.8 g of sulphuric acid, H2SO4. (H=1, S=32, O=16)
Who discovered proton? Golstein or Rutherford?
Q1 Tabulate name of elements,their latin names and symbols.
HCl,
H2,
H2O,
NH3,
CH3OH,
PCl5
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????
explain the rutherford's gold foil experiment with the help of diagram?
what is electrovalency and covalency
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
(a) What are isobars? Give one example. (b) Write any two uses of isotopes
Write two differences between isobars and isotopes.
Why do isotopes have same chemical properties and isobars show different chemical properties?
why is the valency of phosphorus 3 & 5 both ?
222
Rn
86
is an isotope of noble gas radon . how many protons,neutrons&electrons are present in 1 atom isotope of radon?
urgent
How to learn the 30 elements of modern periodic table Quickly?
discrete orbits are also known as_____
what r the rules of distribution of electrons in different shells of an atom.Pls give me all rules of higher classes also.
an element has atomic number 16. write its electronic configuration, number of valence electrons, valency.
identifythe element . is it matal or non-metal? give reson.
What is the valency of Aluminium whose atomic number is 13 ? Give reason.
Suppose that there were two isotopes of Sodium. 28% of the naturally occurring sodium atoms had a mass of 22, and 72% atoms had a mass of 23. What would the average atomic weight of sodium be?
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.
Ans-The evidence for the existence of nucleus in an atom is given by E.Rutherford.He explained this by the alpha-particle scattering experiment .In that some alpha particles were passed through the gold foil.Some alpha particles(Helium 2 positive ions) we're deflected back.From this experiment he concluded that almost all the Mass of an atom is concentrated in it's nucleus.
Protons+Neutrons=Nucleus of an atom.
Please check my answer to this question.
No links plz.
what are properties of anode rays x rays cathode rays and alpha particles
wht r d drawbacks of bohr's model of an atom??
an ion M3+ contains 10 electrons and 14 neutrons.What are the atomic mass and mass number of the element M ? name the element
Give 6 examples of isobars .........
valency of carbon in CH4 , C2H6 , C2H4 , C2H2 ???
a) What is its atomic no.?
b) State its valency
c) Identify the element.
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
how many molecules are present in
a) 9g of water
b) 17g of ammonium
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
influenza and common cold spread faster and is difficult to control explain
State two main postulates of Thomson model of an atom
applications and examples of isotopes an isobars ?
1) write the electronic configuration of element X
2)write the electronic configuration of anion of element Y
3) write the formula of the compound formed by the combination of X and Y.
the description of atomic particles of two elements X and Y is given below:
X Y
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
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
give the atomic masses of important element for class 9
While revolving in discrete orbits, the electrons do not radiate energy. Could it be explained with proper reason with the help of video?
an element X forms an oxide with formula X2O3
rnstate the valency of X,write the formula of chloride of X and sulphate of X.
difference between isotope and isobars
Elements A and B react to form a compound Ax and By. Elements C and D react to form another compond Cp and Dq. What will be the formula of the compound formed, when A and D react?
(HOTS)
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
Suppose that there were two natural isotopes of Copper. 80% of the atoms had a mass of 63, and 20% of the atoms had a mass of 65. What would that average atomic weight of copper be?
who discovered the proton? E. goldstein or rutherford?
What happens when an electron jumps from lower to higher energy levels?
If Z = 3, what would be the valency of the element? Also, name the element.
what is the atomicity of ammonia
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?
calculate the molar mass of CH3OH, Na2S2 03(given atomic mass of C=12u ,H=1u, O=16u ,Na=23u, S=32u)