Answer:
76
Explanation:
Alpha decay is one of the most basic forms of radioactive decay. It has an atomic mass of 4 and a proton number of two.
Undergoing an alpha decay will decrease the atomic mass by four and the atomic number by two.
In this particular question, we are particular about the atomic number. The atom has an atomic number of 78. So taking 2 off this gives 76
Answer:
fsdfsdfsdfsfsfsdfsdfsdfdsfsdfdsfs
Explanation:
sdfsdfsfsdfsdfsd fsdfsdfsdf
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 .
I believe the correct answer would be the last option. The rock cycle is driven by the movement of tectonic plates. The rock cycle describes the different changes that a rock undergoes as a result of the geological processes that happens in the Earth and the movement of the plate tectonics is one of these.
1. Hybridization is a method of sexual reproduction whereas cloning is a method of asexual reproduction.
2. Hybrid animals are sterile, but cloned animals are fertile.
3. Hybrid organisms contain DNA from both male and female parents but cloned organisms contain DNA from only one type of parent.
4. Hybrid has superior character over its parents (improved hybrid vigor) but clones are 100% identical to their parent.
5. Hybridization gives only one hybrid progeny, whereas through cloning unlimited identical organisms can be produced.
