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All you need is a periodic table. The atomic number of an element is the number of protons in the nuclei of all of the atoms of that element. So just look for the element on the periodic table, and its atomic number is the number of protons. However, if you don't have a periodic table available, and you've been given mass number, number of neutrons, and/or the number of electrons, you can calculate the number of protons by doing the following:

mass number - no. of neutrons = no. of protons

no. of electrons in a neutral atom = no. of protons

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How do you find the ratio of neutrons to protons?

The ratio of neutrons to protons in an atom can be calculated by subtracting the atomic number (number of protons) from the atomic mass (sum of protons and neutrons) of the atom. Mathematically, ratio of neutrons to protons = (Atomic mass - Atomic number).


What can you find from the atomic number?

The number of protons in an atom.


How do you figure out protons electrons neutrons?

Find the atomic number. That tells you the number of protons and electrons (in a neutral atom). Then find the atomic weight. The number of protons plus the number of neutrons will equal the atomic weight. So if you know the wt. just subtract the number of protons and you will have the number of neutrons.


How to find the number of protons atomic number and the mass number with 12 as the number of electrons and 10 as the number of neutrons?

To find the number of protons (atomic number), you can use the number of electrons, in this case 12 electrons. Since atoms are electrically neutral, the number of protons is equal to the number of electrons, which is 12. To find the mass number, you add the number of protons and neutrons together. In this case, you have 12 protons and 10 neutrons, so the mass number would be 22.


How do you find the number of protons in sodium 23?

To find the number of protons in sodium-23, refer to the atomic number of sodium from the periodic table. Sodium has an atomic number of 11, which tells you that it has 11 protons. Sodium-23 specifically refers to the total number of protons and neutrons in its nucleus, so it still has 11 protons.

Related Questions

How can you find the number of protons?

The number of protons is the atomic number.


How do find the number of protons?

The number of protons is equal to the number of electrons and the atomic number.


How do you find the ratio of neutrons to protons?

The ratio of neutrons to protons in an atom can be calculated by subtracting the atomic number (number of protons) from the atomic mass (sum of protons and neutrons) of the atom. Mathematically, ratio of neutrons to protons = (Atomic mass - Atomic number).


How do you find the number of protons electrons of an element?

The atomic number of the element is the number of protons, therefore there has to be the same amount of electrons to protons.


How do you find protons in the periodic table?

# protons = atomic number.


How did you find out protons are in the nucleus?

The number of protons in the atomic nucleus is equal to atomic number.


How do you find the number of protons in an elements nucleus?

The number of protons in an elements nucleus is the same number at the atomic number.


How do you find the number of protons in a neon atom?

The number of protons is equal to atomic number: neon 10 has protons.


What can you find with the atomic number and mass number?

atomic number is the number of protons in the atom. mass number is protons and neutrons combined.


What can you find from the atomic number?

The number of protons in an atom.


What is the number of protons in the nucleus of xenon?

There are 54 protons in the nucleus of xenon. You can find the number of protons of any element on the periodic table by noting the atomic number of the element. The atomic number is the same as the number of protons.


How do you find the number of electrons for an element?

It is the same as the number of protons if it is a neutral atom, or the number of protons plus the charge of the ion. The number of protons is the atomic number of the element.