Answer is All of the above
As common sense dictates, Mohs Scale is based on the fact that a harder material will scratch a softer one. By using a simple scratch test, you can determine the relative hardness of an unknown mineral.
Answer:
Rise in charge reduced the size due to rise in attraction between electron and nucleus.
Explanation:
Ion of magnesium is smaller than the atom of magnesium. As the nuclear charge increases, the attraction of electron to the nucleus increases in charged ions form of any element. Due to this increase in charge of magnesium ion, the size of ion reduces
No. of electrons in Mg = 12
No. of proton in Mg = 12
Where as
No. of electrons in Mg2+ = 12
No. of proton in Mg2+ = 10
Answer: Option (b) is the correct answer.
Explanation:
When it rains, then mud in the backyards become wet. It is known that earthworms live inside earth and diffusion of oxygen gets slower through water than through air.
As a result, supply of oxygen to the worms decreases in wet mud hence, they come to the surface in order to breathe.
Thus, we can conclude that wet mud in the backyard most likely formed the earthworms.
