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Discovered : by Sir William Ramsay in London, and independently by P.T. Cleve and N.A. Langlet in Uppsala, Sweden in 1895.
Origin : The name is derived from the Greek ‘helios’,sun.
Description :A colourless, odourless gas that is totally unreactive. It is extracted from natural gas wells, some of which contain gas that is 7% helium. It is used in deep sea diving for balloons and, as liquid helium, for low temperature research. The Earth’s atmosphere contains 5 parts per million by volume, totalling 400 million tons, but it is not worth extracting it from this source at present.
Atomic No:2 MAss No:4

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Why do copper products change color, and what is the name of the process?

Probably, every person wants to know, why over time the copper turns green and becomes bloomed. This is easy to explain: that film is called patina.

Vapor

A gas formed by boiling or evaporating a liquid.

Electrolyte

A substance whose aqueous solutions conduct electricity.

 

Hund's Rule

All orbitals of a given sublevel must be occupied by single electrons before pairing begins.

Base

A substance that produces OH (aq) ions in aqueous solution. Strong soluable bases are soluble in water and are completely dissociated. Weak bases ionize only slightly.

Hydrogen Bond

A fairly strong dipole-dipole interaction (but still considerably weaker than the covalent or ionic bonds) between molecules containing hydrogen directly bonded to a small, highly electronegative atom, such as N, O, or F.

Alpha (a) Particle

Helium ion with 2+ charge, an assembly of two protons and two neutrons.

Aromatic Hydrocarbons

Benzene and its derivatives.

Nodal Plane

A region in which the probability of finding an electron is zero.

 

Stoichiometry

Description of the quantitative relationships among elements and compounds as they undergo chemical changes.