mg number of protons

The nucleus of an atom of an element contains 11 protons and 12 neutrons. Determine the atomic number and mass number of the elemen..

Question: Define the following terms: a) Nucleons b) Atomic number c) Mass number d) Nucleus Answer: a) Nucleons: The particles found inside the nucleus i.e., protons and neutrons are called nucleons. b) Atomic number: The number of ..

Atomic Structure and Charges - The existence of negative and positive charges on these materials can be explained on the basis of the structure of the atom. Almost all the mass of an atom resides in a central nucleus which contains a number of tightly packed protons and neutrons..

There are a small number of radioisotopes of low proton number, which occur naturally. They are produced by bombardment by radiation from outer space (cosmic rays). The most well known of these is radioactive carbon-14, which is produced when nitrogen is bombarded by ..

Question: Why was it not possible to find a meaningful relationship between atomic mass and properties of elements? Answer: Properties of elements depend on the number of electrons in the valence shell. Atomic number gives the number of protons or ..

The degree of hardness of water is defined as the number of parts by mass of calcium carbonate, equivalent to various calcium and magnesium present in one million parts of mass of water. It is expressed in ppm. Now, 10 6 g of water contains CaCO 3 = 44 mg By definition, 1 mol..

Protons and neutrons Nuclear forces Electromagnetic repulsion between the protons Nuclear fusion and fission reactions Radioactive isotopes Three most common forms of radioactive decay (alpha, beta, gamma) Changes in the nucleus in each type of decay Alpha, beta, an..

Later, Henry Gywn-Jeffreys Moseley showed that the atomic number of an element is numerically equal to the number of electrons round the nucleus. The number of electrons in turn is equal to the number of protons in the nucleus. He suggested th..

Strength of an acid depends on the concentration of hydronium ions present in a solution. Greater the numbers of hydronium ions present, greater is the strength of the acid. A strong acid dissociates completely in water. Example: Hydrochloric acid A weak acid dissociates only parti..

Atom is the smallest particle of an element, which may or may not have independent existence. It is made up of subatomic particles like electrons, protons and neutrons. Atoms of one type of element differ from those of the other due to different number of subatomic particl..