Select Board & Class
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?
Z = 3, what would be the valency of the element? Also, name
what were the drawbacks of thomson model of 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
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
if K and L shells of an atom ar full,then what would be the total number of electrons in an atom???
What is the valency of copper?
EXPLAIN THE LAW OF CONSERVATION OF MASS WITH AN EXAMPLE ?
How many electrons can fit into the sub-shell for which n = 3 and l = 1?
the properties of electrons, protons and neutrons.
what are the application of isotopes
What are the drawbacks of Rutherfords atomic model?
difference between electrons protons and neutrons...also find the relation between the three
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????
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?
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.
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 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 ?
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 ?
How to learn the 30 elements of modern periodic table Quickly?
Chlorine has completely filled KL shells. Explain.
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.
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 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??
Give 6 examples of isobars .........
discovery of electrons
the electronic configuration of any one pair of isotopes and isobars.
valency of carbon in CH4 , C2H6 , C2H4 , C2H2 ???
What happens when an electron jumps from lower to higher energy levels?
State 3 characteristics of canal rays.
what is a difference between relative and absolute mass or charge??????????
State two main postulates of Thomson model of an atom
applications and examples of isotopes an isobars ?
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
What is gram atomic mass?
give the atomic masses of important element for class 9
An ion (M2+) contain 10 electrons and 12 neutrons what is the atomic number and mass number of the element M.
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
Advantages and disadvantages of ernest rutherford model of atom.
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?
write three significant features of Bohr's model of an atom.
A compound of carbon,hydrogen and nitrogen contains these elements in the ratio 9 : 1 : 3.5.If its molecular mass is 108,what is the molecular formula?
Name three feature of rutherford's model
what are cathode rays and anode rays?
HOW CAN I CALCULATE VALENCY?
Copyright © 2019 Applect Learning Systems Pvt. Ltd. All rights reserved.
E.g: 9876543210, 01112345678
We will give you a call shortly, Thank You
Office hours: 9:00 am to 9:00 pm IST (7 days a week)