The sum of the number of protons and neutrons in the atomic nucleus is called the atomic mass number.
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One element may exist as a mixture of atoms with different numbers of neutrons. This is in contrast with, and often confused with, the atomic mass (as such, without number). This is the average mass of all naturally occurringatoms of a particular element.
Example:
Naturally occurring chlorine, atomic number 17, has 17 protons but can have either 18 (75%) or 20 (25%) neutrons in its nucleus as well. The Atomic Mass numbers of these two isotopes are 35 or 37 respectively. The atomic mass of the element chlorine is 35.45 a.m.u.
Atoms correspond in that they are all made up of protons, neutrons, and electrons. However, they differ in their mass numbers, which is the sum of protons and neutrons. Atoms of different elements have different mass numbers due to varying numbers of protons and neutrons.
The mass number is the sum of protons + neutrons.
In order to answer this question, the specific isotope of argon must be known. However, I will answer it using argon-40 because it makes up over 99% of the atoms of argon. Argon-40 has a mass number of 40, meaning that the sum of protons and neutrons in the nuclei of its atoms is 40. In order to use this information to determine the numbers of protons and neutrons, you also need to know the atomic number, which is the number of protons in the nucleus of its atoms. Argon's atomic number is 18, so we know that all argon atoms have 18 protons. To calculate the number of neutrons, we subtract the atomic number from the mass number, which is (40-18)=22 neutrons. The number of electrons equals the number of protons in a neutral atom, so argon atoms have 18 electrons. So, to sum things up, neutral atoms of argon-40 contain 18 protons, 22 neutrons, and 18 electrons.
Atoms are composed of protons, neutrons, and electrons. Protons and neutrons are found in the nucleus of the atom, while electrons orbit the nucleus in energy levels.
In the neutral state, all atoms of the same element contain equal numbers of protons and electrons. However, most elements have atoms with different numbers of neutrons. These are called isotopes.
The sum of protons and neutrons in an atom is called mass number.
The sum of all protons and neutrons - Apex Learning
the protons and neutrons.
The mass number of an element is equal to the sum of the elements neutrons and protons.
it is the sum of the protons and neutrons present in the nucleus of the atom.
The sum of all Protons and Neutrons.
Atoms correspond in that they are all made up of protons, neutrons, and electrons. However, they differ in their mass numbers, which is the sum of protons and neutrons. Atoms of different elements have different mass numbers due to varying numbers of protons and neutrons.
Several come to mind. They are both found in the nucleus of an atom. Protons have a positive charge, while neutrons have no charge. They are nearly the same size, though neutrons are a bit larger. The sum of the protons and neutrons in an isotope of an element is its mass number.
The sum of all Protons and Neutrons.
It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.
Mass number = Protons+Neutrons
An atom's mass number is determined by the sum of its protons and neutrons. Protons have a positive charge and determine the element's identity, while neutrons help stabilize the nucleus and contribute to the atom's mass.