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The charge differences cause water molecules to be attracted to each other (the relatively positive areas being attracted to the relatively negative areas) and to other polar molecules. This attraction is known as hydrogen bonding.

An English scientist called John Newlands put forward his law of octaves in 1864.
He arranged all the elements known at the time into a table in order of relative atomic mass.
When he did this, he found that each element was similar to the element eight places further on.

Ethanethiol, commonly known as ethyl mercaptan, is a clear liquid with a distinct odor. It is an organosulfur compound with the formula CH3CH2SH. Abbreviated EtSH, it consists of an ethyl group (Et), CH3CH2, attached to a thiol group, SH. Its structure parallels that of ethanol, but with sulfur in place of oxygen.

Flerovium is a superheavy artificial chemical element with symbol Fl and atomic number 114. It is an extremely radioactive synthetic element. The element is named after the Flerov Laboratory of Nuclear Reactions of the Joint Institute for Nuclear Research in Dubna, Russia, where the element was discovered in 1998.

Earth’s atmosphere is 78% nitrogen, 21% oxygen, 0.9% argon, and 0.03% carbon dioxide with very small percentages of other elements. Our atmosphere also contains water vapor. In addition, Earth’s atmosphere contains traces of dust particles, pollen, plant grains and other solid particles.

Genetics is the study of genes, genetic variation, and heredity in living organisms.
It is generally considered a field of biology, but intersects frequently with many other life sciences and is strongly linked with the study of information systems.
Heredity is the passing of physical characteristics from parents to offspring.
Gregor Mendel was curious about the different forms of characteristics, or traits, of pea plants.
Mendel’s work was the foundation of genetics, the scientific study of heredity.

Transuranium element. The transuranium elements (also known as transuranic elements) are the chemical elements with atomic numbers greater than 92 (the atomic number of uranium). All of these elements are unstable and decay radioactively into other elements.

Fluorine in a compound cannot be separated from the compound through reactions with other chemicals.
Fluorine reacts explosively with hydrogen or water, and in its pure form is capable of igniting concrete when the gas is directed towards it

Brass is an alloy of copper and zinc;

Bronze – copper, tin, aluminium.

Calcium is the fifth-most abundant element in the earth’s crust .

Calcium also plays an important role in muscle contraction, transmitting messages through the nerves, and the release of hormones. If people aren’t getting enough calcium in their diet, the body takes calcium from the bones to ensure normal cell function, which can lead to weakened bones.

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