One of the chemical properties shared by elements in the same group is the charge of ions. Hence, elements in the same group will have similar chemical properties, as they have the same number of valence electrons. Refer to the table above for their electronic configurations. The group number of the element is the same as the number of valence electrons. All elements in Period 3 have 3 electron shells (as seen in their electronic configurations). The period number of the element is the same as the number of electron shells. Hence, we observe that as we go across the period, the nature of the oxides changes from basic to amphoteric to acidic. Non-metals, such as silicon, phosphorus, sulfur and chlorine, form acidic oxides. Some metals, such as aluminium, form amphoteric oxides. Metals, such as sodium and magnesium, form basic oxides. Metals are found on the left-hand side of each period, while non-metals are found on the right-hand side.įrom left to right, there is a decrease in metallic properties and an increase in non-metallic properties. Let us examine the properties of elements across Period 3. They are elements located near the zig-zag line which separates the metals from the non-metals (shaded in green). Metalloids are elements that have both metallic and non-metallic properties. The Periodic Table also classifies elements into metals and non-metals.Ī zig-zag line (red line) separates the metals (shaded in yellow) from the non-metals (shaded in blue) in the Periodic Table. It runs from left to right and there are seven periods of elements, numbered 1 to 7. It runs from top to bottom and there are eight groups of elements, numbered Ⅰ to Ⅶ, and 0.Ī period is a horizontal row of elements. Ī group is a vertical column of elements. The Periodic Table divides the elements into periods and groups. It allows us to predict the properties of an element.It allows us to identify the properties of the elements easily.It allows us to study and understand the relationship between various elements.Advantages for arranging elements in the Periodic Table: The next element is helium (He) with a proton number of 2. The first element in the Periodic Table is hydrogen (H) with a proton number of 1. The Periodic Table is a list of elements arranged in order of increasing proton (atomic) numbers. This article is specifically written to serve the requirements for the Upper Secondary Chemistry students in Singapore. Describe the physical and chemical properties of Group I elements.Describe the relationship between group number, number of valence electrons and metallic/non-metallic properties.Describe the change in metallic properties of the elements across a period of the Periodic Table.Describe the Periodic Table as an arrangement of the elements according to proton number. In this article, we will be learning about the Periodic Table.
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