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One idea is to group together elements that are part of daily life, elements that hold a special place in ceremony and elements that are avoided. We [Indigenous people] understand chemistry as ...

Group 7 of the periodic table is something of an oddity. When the first periodic table was formulated by Mendeleev, it was the only group that contained just a single known element — manganese.

In discussing halogen reactivity (as covered in Core Idea), it is a common practice to argue that as you go down the Group 17 elements it becomes harder for the elements to gain an electron to form a ...

On 17 February 1869, Russian chemist Dmitri Mendeleev jotted down the symbols for the chemical elements, putting them in order according to their atomic weights and inventing the periodic table.

These are almost one-quarter of the periodic table and are mainly found in the first four periods. Of these, 11 are essential elements that our bodies need in larger amounts: oxygen, carbon ...

The 'Trends' section within the RSC Periodc Table will allow you to observe the trends in atomic radius down a group. What is the general trend in atomic radius down a group? The atomic radius ...

Check the RRB Group D important questions for history, geography, general science, current affairs, defence and much more, ...

6 Oganesson (Og) is the most recently added superheavy element (SHE) in the periodic table. It completes the seventh period and belongs to group 18 of the noble gases. So far, only five atoms of ...

The RRB Group D examination will be conducted in a single-phase CBT, physical efficiency test, document verification and medical examination. Check the table below for an overview of the RRB Group ...