Answer:
merits of mendeleev periodic table are:
- it was first scientific and systamatic study of different element.
- there were may gaps for in discovered elements.After their discovery the got their proper place in table.
- with the help of mendeleev periodic table , properties of several elements were studied correctly.
demerits of mendeleev periodic table
- it could not arrange hydrogen as it shows the property of both alkali and halogens.
- it could not arrange isotopes because they have different atomic weight but same atomic number.
- it could not arrange Lanthanides and Actinides.
hope these points helped you
need more points then comment it .
Answer:
469.9K
Explanation:
Using Charles's law equation:
V1/T1 = V2/T2
Where;
V1 = initial volume (ml)
V2 = final volume (ml)
T1 = initial temperature (K)
T2 = final temperature (K)
Based on the information provided:
V1 = 280.0ml
V2 = 440.0 ml
T1 = 26.0°C = 26 + 273 = 299K
T2 = ?
Using V1/T1 = V2/T2
280/299 = 440/T2
0.936 = 440/T2
T2 = 440 ÷ 0.936
T2 = 469.9K
Answer:
Radioactive and are often called radioisotopes
After 4-6 months but i'm happy for you
