Experts plzz i want answer for these questiom DATE: 21.12.2017
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WORKSHEET-I
STD:IX
SCIENCE
STRUCTURE OF THE ATOM
What will be the charge on 48g of Mg 2+ cations?
How many electrons will be present in 1.6g ofCH4 (Methane) ?
Flow many protons together make its 1 gram?
Calculate the difference between in mass of 1 mole of electrons and 1 mole of
neutrons.
For the symbol and T, tabulate three sub- atomic particles found in each of
them.
Write the electronic configuration of any pair isotopes and isobars.
If Bromine atom is availabye in the form of say, isotopes Br— and Br
— 81 50.3 % Calculate the average atomic mass Of Bromine atom.
Calcul ate the average atomic mass Of Chlorine atom.
Why do Helium , Neorr and Argon have zero valency
10. An element X has a mass number 4 and atomic number 2. Write the valency of this
element
•L. In the gold experiment of Geiger and Marsden, that paved way for Rutherfortrs
model of an atom, approximately 1.00% of the alpha particles were found to deflect
at angles greater than 50 degree. If One mole of alpha particles were bombarded on
the gold foil, calculate the number of alpha particles that would deflect at angtes less
