Why do we use periodic table

How are the elements are organized in the periodic table? How are elements arranged in the modern periodic table? What were the contributions of Mendeleev to the periodic table? Explain how the periodic table is organized? Question fe5fc. Question b Question 8bc3b.

The period number of an element signifies the highest energy level an electron in that element occupies in the unexcited state. The number of electrons in a period increases as one traverses down the periodic table; therefore, as the energy level of the atom increases, the number of energy sub-levels per energy level increases. Using the data in the table scientists, students, and others that are familiar with the periodic table can extract information concerning individual elements. For instance, a scientist can use carbon's atomic mass to determine how many carbon atoms there are in a 1 kilogram block of carbon.

The periodic table is organized according to trends in element properties. As you move from left to right across a row of elements, the atomic radius the size of an element's atoms decreases, ionization energy the energy required to remove an electron from an atom increases, electron affinity the amount of energy released when an atom forms a negative ion generally increases, and electronegativity an atom's tendency to attract a pair of electrons increases.

As you move from top to bottom down a column of elements, the atomic radius increases, ionization energy decreases, electron affinity usually decreases, and electronegativity decreases. To summarize, the periodic table is important because it is organized to provide a great deal of information about elements and how they relate to one another in one easy-to-use reference.

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Below are some websites devoted to the periodic table. They have interactive activities for students. In , the periodic table of elements observes its th anniversary. Nights with Bryan Crump has an element of week each Friday night. Visit the International Year of the Periodic Table website. Add to collection. Activity ideas Development of the periodic table — Use this article to find out about the first scientific discovery of an element in and how this grew into the periodic table as we know it today.

Atomic clock — Use the atomic clock teacher resource to familiarise students with the names and symbols of the chemical elements.

Element rap — In this activity, students become familiar with the names and symbols of the chemical elements by creating a rap or poem. Symbol find — In this activity, students become familiar with symbols of the chemical elements by creating them using letters from a phrase or sentence.