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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 ...
Lanthanides are a group of elements also called "rare earths" because they are in the form of oxides. They form the "internal transition elements" next to the actinides, with which ...
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, w ...
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 first period has only two elements, t ...
Actinides are also known as "internal transition elements." They have radioactive properties and are extremely unstable, having a very short half-life. Within the periodic table, they are us ...
Lanthanides are a group of elements also called "rare earths" because they are in the form of oxides. They form the "internal transition elements" next to the actinides, with which ...
Following a classification according to the bonding and ionization properties of the elements, the elements of the periodic table can be classified as:
Metals
Semimetals
No metals
Noble gases
Th ...
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