➡️elements that cannot be broken down to substances with different chemical or physical properties.
A block of the periodic table is a set of elements unified by the orbitals their valence electrons or vacancies lie in. The term appears to have been first used by Charles Janet. Each block is named after its characteristic orbital: s-block, p-block, d-block, and f-block.
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Compunds are divided into molecular compounds and salts.
Elements in the same column, or group, of the periodic table have the same number of valence electrons in their outer energy level. This gives them many similar properties. It describes properties of the different groups of elements.
so the elements are divided into groups.
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Features of Modern Periodic Table. There are eighteen vertical columns known as groups in the modern periodic table which are arranged from left to right and seven horizontal rows which are known as periods.
So that they are easy to identify
and they are set at their places according to their Valencies and atomic masses
Molecular compounds and salts.
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The elements are divided into three types : metal,non-metal and metalloids.
The elements can also be divided into two main groups, the metals and the non-metals. Metals are typically have a metallic sheen (shiny) are malleable (bendable) and conduct electricity. Nonmetals typically do not show these properties. There are some elements that show some, but not all, of the metallic properties.