An element has 16 protons. How many electrons will be present in K, L and M shell of its atom. What will its electrovalency be?
No. of electrons = no. of protons = 16
Distribution of 16 electrons in atom is as follows:
K-shell = 2 electrons
L-shell = 8 electrons
M-shell = 6 electrons
Valence electrons in the element are 6.
∴
Valency or electrovalency is 8 - 6 = 2.
What are the limitations of Rutherford model of the atom?
Describe Bohr's model of the atom ?
Compare all the proposed models of an atom given in this chapter.
Summarize the rules for writing of distribution of electrons in various shells for the first eighteen elements.
Define valency by taking examples of silicon and oxygen.
Explain with examples, (i) Atomic number, (ii) Mass number, (iii) Isotopes, and (iv) Isobars. Give any two uses of isotopes also.
Na+ has completely filled K and L-shells. Explain.
If Z = 3, what would be the valency of the element? Also, name the element.
Composition of the nuclei of two atomic species X and Y are given as under
X Y
Protons = 6 6
Neutrons= 6 6
Give the mass numbers of X and Y. What is the relation between the two species?
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