Lu
Number of neutrons = Mass number - Atomic number According to the periodic table, the "Mass number" of lutetium is 174.97, and the "Atomic number" is 71. Therefore, Number of neutrons = 174.97 - 71 = 103.97 neutrons or approximately 104 neutrons.
Vanadium is a metal element. Mass number of it is 51.
Copper is a metal element. Mass number of it is 64.
Magnesium is a metal element. Mass number of it is 24.
Chromium is a metallic element. Mass number of it is 52.
Coper is a metal element. Mass number of it is 64.
Rubidium is a metal element. Mass number of it is 85.
Sodium is a metal element. Mass number of it is 23.
The atomic number of an element is the number of protons in the nucleus of each atom of the element. Mass number is a property of a particular isotope of the element rather than of the element itself: The mass number is the sum of the numbers of protons and neutrons in the nucleus of each atom of the isotope.
The mass number of an element is the atomic mass rounded to the nearest whole number. For Example, if the atomic mass is 54.94 (Manganese [Mn]), then the mass number will be 55. You can use the mass number to calculate the amount of neutrons in an isotope.
Sodium is a metal element. Atomic mass number of it is 23.