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A method of counting electrons in a covalently bonded molecule or ion, counts bonding electrons as though they were equally shared between the two atoms.

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Bronsted-Lowry Base

A proton acceptor

Catenation

Bonding of atoms of the same element into chains or rings.
The bonding together of atoms of the same element to form chains.
The ability of an element to bond to itself.

K Capture

Absorption of a K shell (n=1) electron by a proton as it is converted to a neutron.

Insoluble Compound

A very slightly soluble compound.

How is colored crystal made?

However, not everyone knows that in addition to the traditional transparent, there is still an unusually beautiful and spectacular colored crystal, which is obtained through the addition of various metal oxides into the glass. They give the crystal unusually noble shades of red, purple, blue, green and pink colors.

Sigma Bonds

Bonds resulting from the head-on overlap of atomic orbitals, in which the region of electron sharing is along and (cylindrically) symmetrical to the imaginary line connecting the bonded atoms.

Conjugated Double Bonds

Double bonds that are separated from each other by one single bond -C=C-C=C-.

Barometer

A device for measuring pressure.

Buffer Solution

Solution that resists change in pH, contains either a weak acid and a soluble ionic salt of the acid or a weak base and a soluble ionic salt of the base.

Chemical Bonds

The attractive forces that hold atoms together in elements or compounds.