At the time of mendeleev 63 elements were discovered but in mendeleev – InterviewSolution

1.	At the time of mendeleev 63 elements were discovered but in mendeleev periodic table there were 8 groups and 7 periods so how he had arranged all 63 elements in his table as 8X7 equals to 56 only.
Answer» At the time of mendeleev 63 elements were discovered but in mendeleev periodic table there were 8 groups and 7 periods so how he had arranged all 63 elements in his table as 8X7 equals to 56 only.

Discussion

No Comment Found

Related InterviewSolutions

The dipole moment of KCl is 3.336×10−29 Coulomb meters which indicates that it is a highly polar molecule. The interionic distance between K+ and Cl− in this molecule is 2.6×10−10 m. The percentage ionic character of KCl molecule, if there were opposite charges of one fundamental unit located at each nucleus is:
on heating with concentrated sulphuric acid, sucrose givesOption:a) CO and CO2b) C, CO2 and SO2c) CO, CO2 and SO2d) C and H2Oe) CO2, SO2 and H2O
Why CH2Cl2 is Polar molecular solid
Which among the following is/are ore/ores of iron?
how many spectral lines r seen for hydrogen atom when e jumps from n2= 5 to n1=1 in visible region
Explain, why electrolysis is an example of redox reaction?
A solution of CuSO4 was kept in an iron pot. After a few days, the iron pot was found to have a number of holes in it. Explain the reason in terms of reactivity. Write the equation of the reaction involved.
Which element from the following has the highest ionisation energy ? (a) P, Na, Cl (b) F, O, Ne (c) Ne, He, Ar Explain your choice.
How many groups and periods are there in the modern periodic table?
Under what conditions does ethane get converted to(a) ethyl alcohol(b) acetic acid