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Why are mass numbers whole numbers?
mass numbers are whole numbers because the mass number is number of protons in an atom, plus the number of neutrons. you can only have a whole neutron and or proton, therefore, all mass numbers are whole numbers.
What is density calculated by?
Density is calculated by dividing the mass and volume of an object.
What is it called when calculated by dividing mass by volume?
Density
Why mass number of are always whole number?
The main reason is that many elements exist in several isotopic forms. These are atoms with the same number of protons and electrons but different numbers of neutrons. Since the atomic mass is essentially based on the number of protons and neutrons in each atom, the element will exist in several forms with different masses. The atomic mass is the average of the masses of these isotopes, weighted together according to their abundance.
Explain why the atomic mass of an element is usually not given as a whole number even though each individual atom of the element has a whole number of protons and neutrons.?
There are two reasons. The first is that the masses of protons and neutrons are not 1 unit but slightly greater. The mass of an atom is the mass of a whole number of protons, a whole number of neutrons as well as the same number of electrons as protons. Overall, therefore, the mass should be greater than the number of protons and neutrons (electrons have very little mass). But some of the mass is converted to energy which is used to hold the positively charged nucleus together. As a result the mass of carbon-12 is an exact whole number (12) and that is the only element for which that is true. The second, and possibly more important reason is that most atoms are found in the form of isotopes which have different numbers of neutrons and so different masses. The atomic mass listed for an element is an average of the masses of all these isotopes, weighted together according to their abundance of earth.
What is the mass number in chlorine?
Chlorine has isotopes with mass numbers ranging from 32 to 40.
What is the mass number for argon 37?
The mass number for argon-37 is 37. It is calculated by adding the number of protons and neutrons in the nucleus of the argon atom.
What is the mass number for Mg?
Magnesium is a metal element. Mass number of it is 24.
Mass number of nickel?
Nickel is a metal element. Atomic number of it is 58.
What is the mass number of ammonia?
The mass number of ammonia is 17. This is calculated by adding the number of protons and neutrons in the nucleus, which for ammonia (NH3) is 7 protons and 10 neutrons.
A certain atom has 27 protons 27 electrons and 33 neutrons Its mass number is?
The mass number is calculated by adding the number of protons and neutrons together. In this case, the mass number would be 60 (27 protons + 33 neutrons).
The number of neutrons in the nucleus of an atom can be calculated by what?
The number of neutrons in the nucleus of an atom can be calculated by subtracting the number of protons (atomic number) from the atomic mass of the atom. Atomic mass - Atomic number = Number of neutrons.
What is silicon mass number?
The mass number of silicon is 28. It is calculated by adding the number of protons and neutrons in the nucleus of a silicon atom. Silicon has 14 protons and 14 neutrons, giving it a mass number of 28.
Atomic mass and number of fluorine?
The atomic number of fluorine is 9, which means it has 9 protons in its nucleus. The atomic mass of fluorine is approximately 19. It is calculated by adding up the number of protons and neutrons in its nucleus.
Identify the mass number and atomic number of a Chlorine atom that has 17 protons and 18 neutrons?
The mass number is calculated by adding the number of protons and neutrons, so for a Chlorine atom with 17 protons and 18 neutrons, the mass number would be 17 (protons) + 18 (neutrons) = 35. The atomic number is simply the number of protons, which in this case is 17.
How are the numbers of neutrons calculated from the period table?
You can find the number of neutrons present in any individual element by subtracting the atomic number from the mass number.
What is the mass number for a sulfur atom that contains 31 neutrons?
The mass number is calculated by adding together the number of protons and neutrons in an atom. A sulfur atom typically has 16 protons, so if it contains 31 neutrons, the mass number would be 16 (protons) + 31 (neutrons) = 47.
