1] Why is completion of each leriod logical ?
2 ] State the characteristics which remain simian and those which show a transition on moving down in a group ?
3 ] State the relation between atomic number and atomic mass ?
4] In the same period or group a gradual change in a particular property may be seen,why ?
I have kept a lot of marks for these questions...
Answers
Answered by
8
Question[1]
I think the could be the reasons:
1) Modern periodic table is arranged in order of increasing atomic numbers and after filling of 7 elements in the second period after lithium the eighth element sodium has same property as that of the lithium and hence placed just below lithium.Same type of periodicity is seen in other periods also. Therefore according to the similarity in the properties they are arranged in the periodic table.
2) The periodic repetition of the elements with similar properties after certain regular interval when atoms are arranged in increasing order of atomic number is called periodicity.
The periodic repetition of the properties is due to the recurrence of the similar valence shell configuration after certain regular interval.
Hence, they are arranged in such a way that the period it belongs share most characteristic with the other elements of its period.
Question [3]
Atomic number is the no. of protons in an atom or no. of electrons in a neutral atom, whereas atomic mass is the sum of mass of the total no. of protons and neutrons in an atom.
Hope it helps..:)
I think the could be the reasons:
1) Modern periodic table is arranged in order of increasing atomic numbers and after filling of 7 elements in the second period after lithium the eighth element sodium has same property as that of the lithium and hence placed just below lithium.Same type of periodicity is seen in other periods also. Therefore according to the similarity in the properties they are arranged in the periodic table.
2) The periodic repetition of the elements with similar properties after certain regular interval when atoms are arranged in increasing order of atomic number is called periodicity.
The periodic repetition of the properties is due to the recurrence of the similar valence shell configuration after certain regular interval.
Hence, they are arranged in such a way that the period it belongs share most characteristic with the other elements of its period.
Question [3]
Atomic number is the no. of protons in an atom or no. of electrons in a neutral atom, whereas atomic mass is the sum of mass of the total no. of protons and neutrons in an atom.
Hope it helps..:)
Answered by
6
1-completion of all periods is logical as each period begins with an element having one valance electron and ends with an element having 8 electrons (completely filled)
2-similar-no. of elecron shells
transition-valance electrons
-non-metallic character
3-atomic mass=2*atomic no.
4-atomic no. keeps changing
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