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atomic number

Rutherford’s Model of an Atom

Last Updated on May 3, 2020 By Mrs Shilpi Nagpal 3 Comments

J.J. Thomson Model of an atom

​Thomson's model of atom J.J. Thomson in 1904, proposed that an atom was a sphere of positive electricity in which were embedded number of electrons. The stability of the atom was explained as a result of the balance between the repulsive forces between the electrons and their attraction towards the centre of the positive Sphere.This model is compared with a watermelon … [Read more...] about Rutherford’s Model of an Atom

valency

Last Updated on March 20, 2019 By Mrs Shilpi Nagpal 13 Comments

Question 1 Define atomic number? Question 2 Define mass number? Question 3 Define valency? Question 4 What are valence electrons? Question 5 What are noble gases? Question 6 An element has atomic number 12.How many electrons are present in K,L,M shell? Question 7 Write the distribution of electrons in an atom of element whose atomic number is 18? Atomic … [Read more...] about valency

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