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In this case, the number 209 represents the sum of protons + neutrons.

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13y ago

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What does the mass number equal?

The total number of subatomic particles in the nucleus


A common isotope of iron (Fe) has an atomic number of 26 and a mass number of 56. The total number of subatomic particles in the nucleus is?

The total number of subatomic particles in the nucleus is the sum of protons and neutrons. For the common isotope of iron with an atomic number of 26, there are 26 protons. Given the mass number of 56, the number of neutrons can be calculated as 56 - 26 = 30. Therefore, the total number of subatomic particles in the nucleus is 26 protons + 30 neutrons = 56 particles.


The atomic number for an element is the total number of subatomic particles?

False; the atomic number is the total number if protons in the nucleus only.


Number of subatomic particles in boron?

well i don't know ask your science teacher


Number of subatomic particles in potassium?

Potassium's atomic number is 19, meaning it has 19 protons in its nucleus. In a neutral potassium atom, there are also 19 electrons orbiting the nucleus. The most common isotope of potassium, K-39, has 20 neutrons, giving it a total of 39 subatomic particles.


Which term is used to describe the way the mass of subatomic particles is described?

Atomic Mass units =]


How do scientists determine the total number of subatomic particle in a nucleus?

Jesus Murphry(;


How many subatomic particles are in nitrogen?

A neutral nitrogen atom has 7 protons and 7 neutrons in its nucleus and 7 electrons in orbitals around the nucleus.


The nucleus of a helium atom contains four subatomic particles how many neutrons does the helium atom have?

Helium has two neutrons and two protons in its nucleus.


What subatomic particles combine to make the mass number?

The mass number of an atom is the total count of its protons and neutrons, which are collectively known as nucleons. Protons are positively charged particles found in the nucleus, while neutrons are neutral particles that also reside in the nucleus. Electrons, which are negatively charged, are not included in the mass number because their mass is negligible compared to that of protons and neutrons.


Total number of particles in the nucleus is called what?

There are two types of particles in the nucleus of an atom, which are the Protons and the Neutrons. The number of particles in the nucleus depends what is the element. For example, Oxygen has 8 protons and 8 neutrons in the nucleus and Phosphorus has 15 protons and 16 neutrons in the nucleus.


How many subatomic paricles are in 2 berylium atoms?

There are a total of 16 subatomic particles in 2 beryllium atoms. Each beryllium atom contains 4 protons and 4 neutrons in its nucleus, as well as 4 electrons orbiting the nucleus.