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# What is the combined mass of protons and neutrons?

## What is the combined mass of protons and neutrons?

Protons and neutrons have approximately the same mass, about 1.67 × 10-24 grams, which scientists define as one atomic mass unit (amu) or one Dalton.

## What are protons and neutrons present in the nucleus together called?

–>The nucleus is the center of an atom. It is made up of nucleons called (protons and neutrons) and is surrounded by the electron cloud.

What does the number 84 in the name krypton 84 represent?

In the case of Krypton-84, this means that you have 84 nucleons, where 36 of these are protons, and the remaining 48 are neutrons. This becomes relevant in nuclear chemistry, where sometimes, you have to balance nuclear equations with respect to the mass numbers (nucleon numbers).

How many protons are in the nucleus?

The number of protons in the nucleus of the atom is equal to the atomic number (Z). The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus.

### How are protons held together inside the nucleus?

Protons and neutrons are held together in a nucleus of an atom by the strong force. And it is the quarks that exchange force carrying particles between each other to give rise to the strong force. The force carrying particles are called gluons.

### What holds the protons together in the nucleus quizlet?

A strong nuclear force between an atom’s protons and neutrons holds together the atom’s nucleus. Protons experience a more powerful attraction to the negatively charged particles in an atom’s nucleus. A strong nuclear force between an atom’s protons and neutrons holds together the atom’s nucleus.

What is the mass of Krypton-84?

83.911 497
Krypton

Isotope Atomic mass (Da) Isotopic abundance (amount fraction)
82Kr 81.913 481 15(4) 0.115 93(31)
83Kr 82.914 126 52(6) 0.115 00(19)
84Kr 83.911 497 73(3) 0.569 87(15)
86Kr 85.910 610 63(3) 0.172 79(41)

What elements mass number is 84?

common krypton
The mass number of common krypton is 84 , and its atomic number is 36 .

## How many neutrons are in the nucleus?

Its atomic number is 2, so it has two protons in its nucleus. Its nucleus also contains two neutrons….Mass Number.

Name Carbon C 6 6 12

## How many protons are in the nucleus of Xe?

54 protons
This element’s mass comes from its nucleus, which contains 54 protons and a varying (but similar) number of neutrons.

How are protons held together in the nucleus Class 12?

As protons are positively charged they repel each other. This force of repulsion is given by Coulomb’s force of repulsion. This nuclear force is stronger than the coulomb’s force so it overcomes the force of repulsion. This is the reason neutrons and protons are held together inside the nucleus.

What holds the nucleus together quizlet?

The parts of the nucleus are held together by the stronger nuclear force, which can keep positive protons from repelling each other in the presence of the nucleus.

### What is the combined number of protons and neutrons?

Aditya Banerjee. The combined number of protons and neutrons is called Mass number. It is also called Nucleon number . Mass number is also called nucleon number, as it is the total number of protons and neutrons present inside a nucleus of an atom.

### What is the mass of a proton and a neutron?

The mass of a proton is 1.00728 amu and a neutron is 1.00867 amu. The combined mass is calculated: 29 protons(1.00728 amu/proton) + 34 neutrons(1.00867 amu/neutron) or 63.50590 amu

What happens when a proton and a neutron come together?

Mass is essentially energy, as in E = mc^2, and when a neutron and proton come together and stay together, energy is emitted from the pair, and this energy comes from mass. The final mass is then less than the initial mass. The combined mass is less than the sum of the masses of a free proton and a free neutron.

What is mass number of atom?

Mass number is also called nucleon number, as it is the total number of protons and neutrons present inside a nucleus of an atom.