80 protons and 121 neutrons
It has 26 protons.
A magnesium atom typically has 12 neutrons. Magnesium has an atomic number of 12, indicating it has 12 protons which is equal to its number of electrons in a neutral atom. The number of neutrons can be calculated by subtracting the atomic number from the atomic mass of magnesium, which is approximately 24.305 amu.
Metals always lose electrons.
The number of protons in an atom is the same as the atomic number of the element of which the atom is an example.
The atomic number is the number of protons in an element. Ex: Molybdenum's A.N. is 42. so it has 42 protons.
A potassium-39 atom has 19 protons since the atomic number of potassium is 19.
Number of neutrons = Atomic weight - Atomic number (number of prtons) The atomic number of magnesium is 12; the standard atomic weight is circa 24,3. But magnesium has many isotopes (three are natural) and the number of neutrons is variable in the isotopes - from 7 to 28. The most common natural isotope, 24Mg, has 12 neutrons.
To find the amount of protons in an atom, you simply look at the atomic number. For example, if the question was, "how many protons are in an atom of carbon", you look at the periodic table and see that carbon is the atomic number six, therefore your answer would be six.
It has 26 protons.
Helium is a non metal element. There are 2 electrons in a single atom.
Mass number = 24 = 12 protons, 12 neutrons
A magnesium atom typically has 12 neutrons. Magnesium has an atomic number of 12, indicating it has 12 protons which is equal to its number of electrons in a neutral atom. The number of neutrons can be calculated by subtracting the atomic number from the atomic mass of magnesium, which is approximately 24.305 amu.
Phosphorus has 15 protons.
Number of protons = Number of electrons = 18Number of neutrons:22 (stable and commonest),20 (stable but less common),18, 19, 21, 23 or 24 (unstable).
Metals always lose electrons.