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It is the number of milligrams of the protective colloid which just prevent coagulation of 10ml of standard gold sol when 1 ml of 10% solution of sodium chloride is added to it. Different lyophilic sols have different gold numbers. Smaller the gold number of the prote..

This is the number of protons present in the nucleus or the number of electrons present outside the nucleus. It is denoted by the letter Z. Atomic number (Z) = Nuclear charge or number of protons (p) = Number of electrons ..

The four numbers, which are required to specify the position and energy of an electron in an atom are called quantum numbers. These are - principal quantum number (n), angular quantum number (l), magnetic quantum number (m) and spin quantum nu..

The sum of the number of protons and neutrons in the nucleus of an atom is called the mass number. It is represented by the letter A. Mass number (A)= Number of protons (p) + number of neutrons (n) From the knowledge of atomic number and ..

Quantum Numbers - Schrodinger wave equation, when solved for hydrogen atom gives mathematical Y functions, which describe the allowed energy states in an atom. It is observed that physical meaningful solutions required three constants n, l and m, which are called quantum numbers..

Orbitals of electrons in atoms differ in size shape and orientation. Definite energies and angular movements characterize atomic orbitals. The state of an electron in any atom is defined by certain permissible values of energy and angular momentum, which describe its location with respect to its nu..

Orbitals of electrons in atoms differ in size shape and orientation. Definite energies and angular movements characterize atomic orbitals. The state of an electron in any atom is defined by certain permissible values of energy and angular momentum, which describe its location with respect to ..

It is the number of wavelengths per centimeter. It is equal to the inverse of a wavelength expressed in centimeter. The relationship that follows between wavelength, frequency and velocity is, velocity = wavelength x frequency c = l x ..

In the division of 5.2765 (five significant figures) by 1.25 (three significant figures) the result is 4.2212 but the correct answer is 4.2..

The total number of protons and neutrons present in one atom of an element is known as its mass number. Mass number = number of protons + number of neutrons It can also be said that: Mass number = Atomic number + number..