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The transition metals are located in the central part of the periodic table. The name "transition" comes from a characteristic that these elements have to be able to be stable by themselves ...
The other metals are located between transition metals and semimetals. Sometimes known as block metals or poor metals, they tend to be soft and have low melting points, in addition to having greater e ...
The noble gases are a group of monoatomic, odorless, colorless chemical elements and have a very low chemical reactivity. Pierre Janssen and Joseph Norman Lockyer were the first to discover, in the 19 ...
Semimetals, also known as metalloids, share properties of both metals and nonmetals. Metallic in their appearance, they can be both bright and opaque with an easily modifiable shape but they are not g ...
Nonmetals are bad conductors of electricity and heat. They are very weak, so they cannot stretch or become a sheet. They can be solids, liquids or gases, their melting and boiling points being depende ...
The noble gases are a group of monoatomic, odorless, colorless chemical elements and have a very low chemical reactivity. Pierre Janssen and Joseph Norman Lockyer were the first to discover, in the 19 ...
In the periodic table of the elements, each row of the table is called the period. The number of levels an atom has determines the period to which it belongs. The fourth and fifth periods are eighteen ...
Alkalines are named because they produce strong bases (or alkalis) that neutralize acids after reacting with water. They are of very low density and good conductors of heat and electricity. They are n ...
The Danish physicist Niels Bohr proposed, in 1913, an atomic model capable of explaining the stability of matter. Bohr, based on Max Planck's quantum theory and Ernest Rutherford's nuclear the ...
In the periodic table of the elements, each row of the table is called the period. The number of levels an atom has determines the period to which it belongs. The first period has only two elements, t ...
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