how to calculate atomic mass

>The mass of electrons is negligible compared to the mass of the protons. Ordinary hydrogen is the only element that has no neutron in it. According to Bohr electrons revolve around the nucleus in fixed orbits called K, L, M, N etc. The energy of the shells increases as the dist..

. He was awarded the Nobel Prize in 1908. The famous words of Rutherford on completing the alpha rays scattering experiment were: 'It was quite the most incredible event that has ever happened to me in life. It was almost as if you fired a 15 inch shell into a piece of tissue paper and it came back..

Atom was derived from the Greek word 'atoms', meaning 'indivisible'. Thus, it was considered to be indivisible.Atoms of the same element are identical in shape, size, mass and other properties.Atoms cannot be created, divided or destroyed duri..

Element Symbol Atomic Number Relative Atomic mass Actinium Ac 89 227 Aluminium Al 13 27 Americium Am 95 243 Antimony Sb 51 122 Argon Ar 19 40 Arsenic As 38 75 Astatine At 95 210 ..

Calculations Based on Chemical Equations - In a chemical reaction there is a rearrangement of particles. This rearrangement of particles, results in drastic changes in the properties of the substances. For e.g., sodium and chlorine are very reactive elements. When they combine, an electro..

Atomic masses of many elements are in fractions not in whole number..

The mass of 1/12 part of 12 C isotope of carbon is equivalent to one atomic mass uni..

Calculate the volume of carbon dioxide formed at STP in 'ml' by the complete thermal decomposition of 3.125 g of pure calcium carbonate (Relative atomic mass of Ca=40, C=12, O=16..

;). For Balmer series, n 1 = 2, n 2 = 3,4,5,… For Paschen series, n 1 =3, n 2 = 4,5,6… For Brackett series, n 1 = 4, n 2 = 5,6,7…. For P fund series, n 1 = 5, n 2 = 6,7,8…. Total energy of an electron in a stationary orbit is calculated from the relation A..