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The Fundamental Unit Of Life

Question

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Atomic numbers and atomic mass numbers of the elements are given below. Complete the following information in the blanks:

Elements Atomic mass number No. of protons No. of neutrons Electronic configuration
A 28 - - -
B 20 - - -
C 23 - - -
D 35 - - -
E 40 - - -

Solution

Elements	Atomic mass number	No. of protons	No. of neutrons	Electronic configuration
A	28	14	14	2 8 4
B	20	10	10	2 8
C	23	11	12	2 8 1
D	35	17	18	2 8 7
E	40	20	20	2 8 8 2

Some More Questions From The Fundamental Unit of Life Chapter

Compare the properties of electron, proton and neutron.

What are the limitations of J.J. Thomson’s model of atom?

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.

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