# Which subatomic particles contribute to an atoms mass number but not atomic number?

## Which subatomic particles contribute to an atoms mass number but not atomic number?

Although similar in mass, protons are positively charged, while neutrons have no charge. Therefore, the number of neutrons in an atom contributes significantly to its mass, but not to its charge. Electrons are much smaller in mass than protons, weighing only 9.11 xd7 10u221228 grams, or about 1/1800 of an atomic mass unit.

## Which types of subatomic particles contribute to an atom’s mass?

Neutrons and protons constitute almost all of an atom’s mass. The third type of stable particle is the electron. Electrons have a negative charge but are extremely small and have a mass only 1/1850 that of a proton or neutron. They are so small that for practical purposes they do not contribute to the mass of the atom.

## Which subatomic particles contribute significantly to the atomic mass for any given element?

Protons are massive particles with unit positive electric charge; neutrons are massive particles with NO electric charge. Together these constitute MOST (x26gt;99.9%) of the mass of the atom.

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## Which particles contribute to the mass number and which do not why?

Which particles contribute to the mass number and which do not? Why? Electrons do not affect the mass number but neutrons and protons do. Electrons do not have a mass.

## Which subatomic particles contribute to an atoms mass but not its atomic number?

Although similar in mass, protons are positively charged, while neutrons have no charge. Therefore, the number of neutrons in an atom contributes significantly to its mass, but not to its charge. Electrons are much smaller in mass than protons, weighing only 9.11 xd7 10u221228 grams, or about 1/1800 of an atomic mass unit.

## Which subatomic particles contribute to an atom’s mass number?

Together, the number of protons and the number of neutrons determine an element’s mass number: mass number protons + neutrons. If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number.

## Which subatomic particles have a mass?

Protons are positively charged particles, have mass, and are located in the center, or nucleus of the atom. Neutrons have no charge, have mass, and are also located in the nucleus of the atom.