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# What is the number of protons plus the number of neutrons in an atom always a whole number?

Updated: 9/26/2023

Wiki User

6y ago

The two are counts and so natural numbers. The set of natural numbers is closed under addition.

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6y ago

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Q: What is the number of protons plus the number of neutrons in an atom always a whole number?
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### The mass number of an element is equal to the total number of?

protons and neutrons in the nucleus of an atom. It is represented by a whole number and is used to identify different isotopes of an element.

### What is a whole number which represents the total number of protons and neutrons?

This is the mass number.

### Which trem describes the sum of the number of protons and neutrons in an atom?

"Atomic mass" is the sum of the number of protons and neutrons in the nucleus of the atom. All atoms of an element have the same number of protons. For example, all iron atoms have 26 protons. But while most (90%) have 30 neutrons, there are isotopes of iron that have anywhere from 26 to 36 neutrons. So the published "atomic mass" is the weighted average of the combined number of protons and neutrons. That's why the atomic number is always a whole number, but the atomic mass is a decimal.

### What is the sum of protons and neutrons known as an element?

The sum of protons and neutrons in an atom is known as the atomic mass or mass number of an element. It is typically shown as the whole number next to the element's symbol in the periodic table.

### Why are atomic numbers always whole numbers?

Atomic numbers represent the number of protons in an atom's nucleus, which are always whole numbers because protons are indivisible particles. Atomic numbers cannot be fractions or decimal numbers because they refer to a count of discrete, whole particles.

### The mass number of an elements is equal to?

The mass number of an element is equal to the total number of protons and neutrons in its nucleus. It is rounded to the nearest whole number on the periodic table.

### How do you calculate the number of neutrons an atom of a specific element has?

You can calculate the number of neutrons an atom has by subtracting the atomic number (number of protons) from the atomic mass (rounded to the nearest whole number). Neutrons are the difference between these two values.

### What equals the number of neutrons plus the number of protons in an atom?

The sum of the number of protons and neutrons in an atom is known as the atomic mass. It is equivalent to the mass number of the atom, which represents the total number of protons and neutrons in the nucleus.

### In order to calculate the number of neutrons you must subtract the from the?

In order to calculate the number of neutrons, you subtract the atomic number (number of protons) from the atomic mass (rounded to the nearest whole number). Neutrons are important for stabilizing the atomic nucleus alongside protons.

### How do the numbers of protons, number of neutrons, and the mass number related?

mass no. = no. of protons + no. of neutrons

### How do you find the number of nucleons?

To find the number of nucleons in an atom, you add the number of protons and the number of neutrons together. Nucleons are the collective term for protons and neutrons found in the nucleus of an atom.

### Why is lithium's mass number a decimal number?

The mass number is a whole number, but the atomic mass may not be. Mass numbers are the total number of neutrons and protons in an isotope (different from atomic numbers, which are the whole numbers of protons only). These are also whole numbers, and for most lithium, it is 7. The mass number is 6 for lithium-6, which has only 3 neutrons. However, the "atomic mass" of an element is measured in atomic mass units, which are 1/12 of the weight of a carbon-12 atom (6 protons and 6 neutrons). Since neutrons are slightly heavier than protons, and there are more neutrons than protons in lithium-7 (3 protons to 4 neutrons), the atomic mass is slightly more than 7.