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:
H2O
H2O
Explanation:
because the are only two hydrogen that can react to Oxygen
Answer:
true
Explanation:
there is a transfer of electrons from one material to the other material. This causes one object to become positively charged (the electron loser) and the other object to become negatively charged (the electron gainer).
Answer:
As the Earth rotates, it also moves, or revolves, around the Sun. ... As the Earth orbits the Sun, the Moon orbits the Earth. The Moon's orbit lasts 27 1/2 days, but because the Earth keeps moving, it takes the Moon two extra days, 29 1/2, to come back to the same place in our sky.
Explanation:
