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?

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 ?

Compare the properties of electrons, protons and neutrons.

what are the application of isotopes

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

 Who discovered proton? Golstein or Rutherford?

What happens when an electron jumps from lower to higher energy levels?

Q1 Tabulate name of elements,their latin names and symbols.

• 1.  a/2
• 2.  a
• 3.  a/(4/√3)
• 4.  a/(4/√2)

explain the rutherford's gold foil experiment with the help of diagram?

elements from A to E have in them the distribution of electrons,protonsand netron as follows

element  electrons  neutrons  protons

A  4  4  3

B  8  9  9

C  18  22  18

D 17  20  17

E  17  18  17

MAKING USE OF THIS DATA FIND  CATION, ANION, A PAIR OF ISOTOPES, AN ATOM OF NOBLE GAS

THIS QUESTION IS THERE IN MY ASSIGNMENT WHICH I HAVE TO SUBMIT ON MONDAY PLEASE ANSWER IT AS FAST AS POSSIBLE PLEASE

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.

valency of carbon in CH4 , C2H6 , C2H4 , C2H2 ???

why is the valency of phosphorus 3 & 5 both ?

How to learn the 30 elements of modern periodic table Quickly?

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 the valency of Aluminium whose atomic number is 13 ? Give reason.

if rutherford had taken beta particles instead of alpha particles in his model of atomic theory
then what would happen ?

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.

what are properties of anode rays x rays cathode rays and alpha particles

 wht r d drawbacks of bohr's model of an atom??

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 ?

 Give 6 examples of isobars .........

 discovery of electrons

will 35Cl and 37 Cl have different valencies ? justify your answer?

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

Why does Anode Rays depend on the nature of the gas present in the discharge tube ?

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 N_A = 6 × 10²³ atoms)

(A) 1800 (B) 1600 (C) 1800 N_A (D) 3200 N_A

 applications and examples of isotopes an isobars ?

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.

1. Calculate the molecular mass of CaCO₃ at mass Ca=40u,C=12u,O=16u
2. Verify by calculating that

• 5 moles of CO₂ and 5 moles of H₂O do have the same mass.
• 240g of calcium and 240g of magnisium element have a mole ratio of 5:3.at mass H=1u ,Ca=40u,Mg=24u

what is difference between Isotopes, Isobars and Isotones

Calculate the energy associated with photon of light having wavelength 6000 Angstrom . [ h = 6.624 x 10^-27 erg - sec ]

Please help and explain .

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

How many electrons can fit into the sub-shell for which n = 3 and l = 1?
options:

who discovered the proton? E. goldstein or rutherford?

which has highest e/m ratio

a) he 2+

b)h

C)H+

d) he+

If Z = 3, what would be the valency of the element? Also, name the element.

An ion M³⁺ has 10 electrons and 14 neutrons

What is the atomic number and Mass number of M???

(please explain in detail)

write three significant features of Bohr's model of an atom.

 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?

Name three feature of rutherford's model

what is light paddle wheel and what is its function

what are cathode rays and anode rays?