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July 29, 2014

Homework Help: chemistry

Posted by pooja on Friday, May 4, 2012 at 10:02pm.

1.what is meant by atomic number of an element?

2.the mass number of an element is 18,it contains 7 electrons.what is the number of protons and neutrons in it?what is the atomic number of the element?

3.an element has an atomic number of 11 and its mass number is 23?what is the arrangement of electrons in the shells? state nuclear composition of an atom of the element?

4.what is the atomic number of an element which has 7 electrons in the M shell?(the K and L shells are completely filled with electrons)?

5.an element has atomic number 13 and atomic mass of 27.(a)how many electrons are there in each atom of the element?(b)how are these electrons distributed in the various energy levels?

6.give the number of protons,neutrons and electrons per atom in the two isotopes of chlorine 17Cl^35 and 17cl^37?

7.what is the reason for the different atomic masses of the isotopes of an element?

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