Q&A for How to Find the Number of Protons, Neutrons, and Electrons

The number of protons will never change. Atoms with negative or positive charges just indicate a gain or loss of electrons.

You will find actinium in group 3, period 7 of the periodic table. The atomic number of actinium is 89, which means there are 89 protons. Because there is no net charge, we know that # protons = # electrons, so there are 89 electrons as well.

All the protons are present in the nucleus, or centre of an atom. You need the atomic number to find the amount of protons and/or electrons, unless you have the amount of neutrons and the atomic mass, in which case you can simply subtract the amount of neutrons from the atomic mass, leaving the amount of protons in the atom. The atomic number (number at the top) is the amount of protons and the amount of electrons. So if an element has an atomic number of 5, you know that it has 5 protons and 5 electrons. The atomic mass (number at the bottom) is the amount of protons and neutrons added together. Whichever you know, you subtract from the atomic mass.

The number of electrons in an element is the same as the number of protons.

A group is the elements in a vertical column of the periodic table. A period is all the elements contained in a horizontal row.

Valance electrons are the electrons in the outermost layer of the Bohr model of an atom.

The number of neutrons can be found simply by identifying the atomic mass (found at the bottom of the element on the periodic table) and the atomic number. Subtract the atomic number from the atomic mass. Remember that the given atomic mass has to be rounded off to the nearest whole number before any further calculations.

Protons are positively charged, electrons are negatively charged, and neutrons have no (neutral) charge.

The atomic number is the proton. The number of electrons in an atom is always the same as the number of protons in the nucleus, unless it is an isotope. The neutron is the atomic mass minus the atomic number.

Five protons and 6 electrons would give an atom a negative charge, as the number of electrons are more than the protons, and electrons are negative.

Rounding the atomic mass will be the same as rounding any decimal number. If the digit is less than 5, keep the digit before it the same (e.g., 0.44 becomes 0.4). If the digit is 5 or greater, round the previous digit up (e.g., 0.45 becomes 0.5).

The atomic mass of boron is 10.811.

An element is a substance that is made up of one type of atom. When two or more elements are joined together, molecules, compounds and complexes are obtained. Before we understand what a mixture is, we need to know what a pure substance is. A pure substance is one that is composed of only one type of particle -- examples include oxygen, gold and others. A mixture is a type of substance in which two or more pure substances are mixed but are not chemically combined (i.e. chemical reactions do not occur). A compound is a molecule made of atoms from different elements. All compounds are molecules, but not all molecules are compounds. An atom is the smallest component of an element, characterized by a sharing of the chemical properties of the element and a nucleus with neutrons, protons and electrons.

Carbon-12. Carbon-12 has a mass of 12 and an atomic number of six, hence the number of neutrons = 6 because 12-6=6. There are 6 protons because the atomic number is 6, and 6 electrons because the # protons = # electrons.

Protons + Neutrons = Mass number. Therefore, obtain the mass of the atom and subtract the number of protons from it to get the number of neutrons.

Find the atomic number. The atomic number is the number of protons (the positive charge) and therefore electrons (the negative charge).

Yes. Very few have the same. It all depends on the element.

In atoms, the number of protons and the atomic number are equal to the number of electrons.

If you subtract atomic mass with the proton number of the element, you should get your neutron count.

If you mean if the atom of an element is not charged, then the number of electrons should be the same number as the atomic number of the element. If you mean that the element is non-reactive, then the valence electrons of the atom of the element should either be 2 or 8 (this implies that the atom is stable).

The number of electrons in an atom equals the atomic number. The A.M of Helium = 2, therefore electrons = 2. However, if you are talking about a charged helium particle, the electrons will differ. The charge of a helium particle = 2+. This implies that a helium ion lost two electrons; therefore, the present number of electrons will be obtained by subtracting the charge from the atomic number, i.e, 2-2 = nil.

There would be 95 protons and 148 neutrons, so there would be 243 particles total.

The number of electrons is equal to the number of protons in an uncharged atom. The number of protons is equal to the atomic number, which is written above the element on the periodic table.

The mass number equals the number of protons and neutrons together. The atomic mass is the average mass of all the isotopes of a certain type.

No, the relative mass of an electron is 1/1840 the mass of a neutron.

On a structural model, the difference between a single and double bond is the amount of outer electrons that are shared. For instance, Ethylene (C2H4) forms double bonds easily. Although the hydrogen forms single bonds and only forms a pair to the carbon, the carbon itself will bond to the other carbon and form four shared electrons. When written, the four shared electrons are counted in pairs, thus being two pairs or a double bond. It is best explained when illustrated, but in simple terms, a single bond has two shared electrons forming one pair, while a double bond has four shared electrons and forms four pairs.

The atomic number is located above the element symbol in the periodic table, in the upper left-hand corner of the square. If you know the number of protons of the element, you can find the atomic number because they are the same.

The valency of an atom is equal to the number of electrons in the outer shell if that number is four or less. Otherwise, the valency is equal to eight minus the number of electrons in the outer shell. Once you know the number of electrons, you can easily calculate the valency.

Yes. The amount of protons is equal to the atomic number, the number of electrons is equal to the atomic number, neutrons is the only difference. Neutrons are calculated by taking the atomic weight (or mass) and subtracting it from the atomic number. If the atomic number is smaller, subtract the atomic number from the mass.

You can't. You must have the atomic mass to find the amount of neutrons. Atomic mass - atomic number = amount of neutrons. The atomic mass can be found on a periodic table, usually under the element's symbol.