Last seen: Jan 25, 2021
Isotopes of chlorine: Electronic configuration of each of them: 2,8, 7 Isobars: Electronic configuration of 20Ca → 2, 8, 8, 2 Electronic...
Mass number of oxygen atom = No. of protons + No. of neutrons = 8 + 8 = 16 Mass number of sulphur atom = No. of protons + No. of neutrons = 16 +...
We know that, No. of electrons (e) = No. of protons (p) = Atomic number (Z) 1. No. of electrons = 8 ∴ Atomic number = 8 2. The number of prot...
Valency of an atom is the number of electrons gained, lost or shared so as to complete the octet of electrons in the valence shell. Valency of chlor...
The maximum number of electrons present in a shell = 2n2 where n – shell number Value of n for K shell = 1 ∴ Maximum number of electrons in K shell ...
Atomic number of carbon = 6 Hence first shell (K-shell) have 2 electrons and the remaining 4 electrons will be present in the second shell, i.e. L-she...
Mass number of helium = 4 Number of protons = 2 Number of neutrons (n) = Mass number (A) - No. of protons (p) = 4 - 2 = 2 Thus, no. of neut...
The three sub-atomic particles of an atom are: electron proton neutron.
On using the foil of heavy metals like gold (e.g., platinum, silver etc.) the observation will be same but if the foil is of light metal (e.g., sodium...
Bohr’s model of an atom with three shells. 2s.png
Proton, a positively charged sub-atomic particle is present in the nucleus of an atom according to Rutherford’s model of atom.
According to Thomson’s model of an atom: An atom consists of a positively charged sphere and the electrons are embedded like the seeds in a water-...
No, the atom will not carry any charge because the electron has one negative charge (-1) and the proton has one positive charge (+1). They netutralise...
The beam of rays which travel in a direction away from anode towards cathode when a gas, taken in a discharge tube is subjected to the action of high ...
(a) one gram of gold will contain = 0.9 g of gold. ∴ Number of mole of gold = = = 0.0046 ∴ 0.0046 mole of gold will contain = 0.0046 x ...
In the reaction flask both the reactants combined to give new products. Yes. We should put a cork on the mouth of the flask so that no other gases i...
Mole-One mole of any species (atoms, molecules, ions or particles) is that quantity or number having a mass equal to its atomic or molecular mass in g...
The atoms are very tiny and their individual mass cannot be calculated as it is negligible. Hence the mass of atoms is expressed in units with respect...
(a) Mass of one atom of oxygen 1 mole of oxygen atom = 16 gm = 6.022 x 1023 atoms ∴ Mass of one atom of oxygen = = 2.65 x 1023 (b) Mass of one ...
(a) Atoms of some elements are not able to exist independently. For such elements atoms form molecules and ions. In case of metals and inert gases ato...