Question

An element X-24 is a radioactive isotopes used to diagnose restricted blood
circulation. How many clectrons, prouons and neutrons are there in this isotope if
its valance shell electronic is 3s1​

Answer 1

Answer:

Magnesium, in its elemental form, has 12 protons and 12 electrons. 

The neutrons are a different matter. Magesium's average atomic mass is 24.305 atomic mass units, but no magnesium atom has exactly this mass. 

Atomic masses like the one quoted above are found by taking an average of the masses of each isotope, weighted based on how much of each is present in nature. 

An isotope is a compound with the same number of protons and electrons, but different number of neutrons. 

The three most natural isotopes of Mg are Mg-24, Mg-25, and Mg-26. 

Mg-24 (12 neurtrons) is 78.9%, Mg-25 (13 neutrons) is 10% and Mg-26 (14 neutrons) is 11.01%, of all the Magnesium found in nature. There are also synthetic isotopes, created as byproducts of nuclear decay or intentionally for commercial use, so they aren't included. 

So you might account for this isotope problem by saying that about 79% of all Magnesium atoms have 12 neutrons, 12 protons, and 12 electrons.