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# What is the mass number of a sodium atom?

Updated: 9/17/2023 Wiki User

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Sodium is a metal element. Atomic Mass number of it is 23. Wiki User

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Q: What is the mass number of a sodium atom?
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### What is the difference in mass of Na ion and Na atom?

The difference in mass between a sodium atom and a sodium ion (supposing Na+) is 9.10938188 &times; 10-31kg (the mass of an electron). This is due to the sodium atom losing an electron to form an ion. In order to attain the mass of a single sodium atom you need to divide the molar massn (mass number) of sodium by avogadro's number. You can then find the mass of the ion by subtracting the mass of an electron from the mass of a sodium atom.

### Which notation represents an atom of sodium with an atomic number of 11 and mass number of 24?

An atom of sodium with an atomic number of 11 and mass number of 24 is 2411Na.

### What is the atomic number and mass number of an atom with 11 protons and 12 neutrons?

Its atomic number is 11 and its mass is 22.99. This atom is a sodium atom.

Isotopes.

12

12

### How many neutrons and protons does neutral atom of sodium with an atomic mass number of 23 have?

Every sodium atom has 11 protons, the atomic number of sodium. The isotope with mass number 23 has (23 - 11) or 12 neutrons, because the mass number of an isotope is defined as the sum of the numbers of protons and neutrons in the isotope.

23

### What is the mass number of an atom that has 12 neutron and 11 protons?

The mass number would be 23 and the atomic number 11 making it sodium.

### What is the mass number of an atom with 11 protons 11 electron and 12 neutron?

The corresponding atom is sodium 23.

### How does an atom of sodium has a larger mass than a atom of neon. how is this possible when neon has so many more valence electrons?

sodium has more protons and neutrons. electrons have practically no mass, valence electrons are just outer orbital electrons. sodium has 11 protons, 11 electrons, and 12 neutrons. Mass is 23. neon has 10 protons, 10 electrons, and 10 neutrons. Mass is just 20. The neon atom has 10 protons and 10 neutrons for a mass number of 20. The sodium atom has 11 protons and 12 neutrons for a mass number of 23. The number of valence electrons has no bearing on mass number or atomic weight.

### What is the Atomic number of Sodium-23?

Mass number is the number of protons and neutrons in the nucleus of an atom. Atomic number on the periodic table is the number of protons in the nucleus of an atom. mass number - atomic number = number of neutrons The atomic number of sodium is 11. Specified mass number is 23. Therefore, 23-11 = 12 neutrons