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The number of protons in an atom is the atomic numberThe number of protons is equal to the atomic number of an atom. It is very important in knowing the number of electrons that surround the nucleus of an atom. In an atom, the electrical charge is neutral, due to the equal number of positive (protons) and negative (electrons) charges. The atomic number represents the protons in an atom and also identifies the element. Hydrogen has one proton. No other atom has just one proton. Heluim has two protons and no other element has only two protons. Lithium has three protons and so on.

The atomic number is equal to the number of protons in the nucleus, and for neutral atoms, it is the same as the number of electrons. In an attempt to keep atoms and ions from getting confused with one another, it is best to think of atoms as always being electrically neutral and ions should be considered charged positively or negatively depending on whether electrons are gained or lost by an atom during the chemical combination of atoms in forming substances such as water, salt and rust found on metals. Protons in atoms and ions are always the same for a specific atom.

Every element has a unique atomic number, and so each element's identity is determined by the number of protons in its nucleus.

However, the same element can have different numbers of neutrons in its nucleus. Two atoms of the same element with two different numbers of neutrons in the nucleus are called isotopes. Also, note that if an atom is not charged (neutral), then the number of protons must equal the number of electrons, and so the atomic number is also equal to the number of electrons in a neutral atom of each element.

However, if the atom is charged (and therefore called an ion), it will have a different number of electrons orbiting it. If the number of electrons is less than the number of protons, it will be a positively charged ion, and the charge will equal the difference between the number of electrons and protons. The same is true if it has more electrons than protons, except now the charge will be negative.

Look under the Web Links below this answer for a Periodic Table. The number listed for each element is its atomic number. Also see the Related Questions links for more information about the number of protons, neutrons, and electrons in an atom.

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โˆ™ 2016-10-25 08:22:03
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Q: What is the atomic number and what does it tell you about the number of protons in an atom?
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Related questions

What does the atomic number of an atom tell you about the atom?

The atomic number of an atom represents the number of protons in that atom.


What does the atomic number of an atom tell you?

The atomic number of an atom tells you the number of protons in the nucleus of the atom.


What does protons tell you in an atom?

protons tells us the atomic number of that atom.


What do the atomic number and the mass number tell you about the atom?

the atomic number is the number of protons/electrons in the atom


What does the number of protons in an atom tell you?

The Atomic Number


Can an atomic number tell you how many protons an atom has?

The atomic number is the number of protons in an atom's nucleus.


What does atomic number tell you?

Tell you the number of protons and electrons in an atom


What does the atomic number tell you about the atom?

It tells you the number of protons/electrons in an atom.


What does the atomic number tell you?

The atomic number tells you how many protons and electrons are in a specific element.Atomic number tells us about protons. Number of protons that atom contains.


What does the atomic number of a element tell you?

No. of protons in the atom.


What does the Atomic Number tell you about a neutral atom?

The atomic number tells you how many protons are in an atom. This number is not equal to the number of protons or electrons. Therefore, the atomic number is the same for an ion of an element as well as the neutral atom.


What does an element's atomic number tell us about the protons in an atom of that element?

Atomic number is equal to number of protons. It is also equal to number of electrons in a neutral atom.


What does the atomic number tell you about what is inside the nucleus of an atom?

The atomic number is equal to the number of protons.


What does the atomic number tell you the number of in a neutral atom of an element?

The atomic number of an element is the number of protons in each atom of the element, whether neutral or not. If the atom is neutral, the number of electrons in the atom is the same as the number of protons.


What does the number of protons in an atom also tell you?

The element's atomic number.


What does the atomic number tell you about an element's atom?

It describe the Number of Protons.


What does the atomic number and atomic mass tell us about an atom?

The atomic number tells us how many protons are in the atom and therefore the species of atom. The atomic mass tells us how many neutrons and protons are in the nucleus of the atom.


What does the number of protons tell you about the atomic number?

It tells you about the number of electrons in atomand thus indirectly determines the atomic no. of the atom. this is because the no. of protons and nuetrons in an atom are equal.


How many protons are there in an atom of Mercury?

The atomic number of mercury will tell you this (the atomic number = number of protons (and electrons)). The atomic number of Mercury is 80.80.


What the atomic number tell us?

The atomic number of an atom is the number of protons in the nucleus of an atom. The number of protons determines the identity of an element and its properties. Hope this helps :3


What atomic number of an element that will not tell you the number of?

Atomic number(z) of an element is the number of protons present in an atom.z = p(protons)


What does the atomis number tell you?

Is the number of protons in an atom determines its atomic number


What does an atomic number tell you about an atom?

We use atomic number for recognize chemical elements. atomic number means, how many protons are there in a single atom.


How can you tell how many neutrons an atom has?

Atomic mass minus number of protons (atomic number)


How do you tell how many protons neutrons and electrons are in an atom?

IF you know the atomic mass and the atomic number the atomic no. is the number protons and electrons(number of protons is the same as the number of electrons) and whatever the atomic mass - protons and you will get the number of neutrons

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