What percentage of the earth is covered by water?

71 percent

Explanation:

I looked at many sources this is correct

71%

Explanation:

You will also here its about 3/4 or 2/3, but the absolte amount is 71%.

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

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particle   p is an electron and particle q is a neutron