what is the atomic weight of an atom x which has 14 protons 14 electrons and 12 neutrons
2
14
12
26
http://www.webelements.com/
but the correct answer isn't listed.
To determine the atomic weight of an atom, you need to know the atomic number and the atomic mass.
The atomic number of an atom represents the number of protons in its nucleus. In this case, atom X has 14 protons. The atomic number is also equal to the number of electrons in a neutral atom, so atom X also has 14 electrons.
The atomic mass of an atom is the sum of the masses of its protons and neutrons. In this case, atom X has 14 protons (mass of 1.0073 amu each) and 12 neutrons (mass of 1.0087 amu each).
To find the atomic weight, you'll need to calculate the atomic mass.
(14 protons × 1.0073 amu/proton) + (12 neutrons × 1.0087 amu/neutron) = 28.0862 amu
Therefore, the atomic weight of atom X is approximately 28.0862 amu.
Based on the options given, none of them match the calculated atomic weight of atom X (28.0862 amu).