An element X- 24 is a radioactive isotopes used to diagnose restricted blood circulation. How many electrons, protons and neutrons are there in this isotopes if its valency shell electronic is 3s^1?

12protons, 12neutrons, and 12electrons.

Explanation:

An element X- 24 is Magnesium, in its elemental form, it consists of 12 electrons and 12 protons. Magnesium's average atomic mass is 24.305 amu. Isotope is known as a compound with the same number of electrons and protons but a different number of neutrons. 

The three most natural isotopes of Magnesium are Mg-24 (12 neutrons) is 78.9%, Mg-25 (13 neutrons) is 10% and Mg-26 (14 neutrons) is 11.01%, all found in nature. So, about 79% of all Magnesium atoms consist of 12 protons, 12 neutrons, and 12 electrons.

weight of any object is given by

w = m*g

where m is mass of the object and g is the acceleration due to gravity.

for earth the value of g is 9.8 m/s^2 so

w=117.6 n m=12 g=?

117.6=12g => g=9.8 m/s^2

which is the force of gravity on earth.