Chemistry for Kids: Elements Halogens

Transition metals include the elements that are most often placed below the periodic table (the pink- and purple-shaded elements in theFigureabove). Those that follow lanthanum are called lanthanides. They are all relatively reactive for transition metals. Those that follow actinium are called actinides. This means that they are unstable, so they decay into different, more stable elements.

It is an Actinoid Metal with the symbol No. Nihonium is a radioactive metal that has the atomic number 112 in the periodic table, its appearance is not fully known due to the minuscule amounts produced of it. Flerovium is a radioactive metal that has the atomic number 114 in the periodic table, its appearance is not fully known due to the minuscule amounts produced of it.

The halogens all have seven electrons in their outer shells. Valence electrons are the electrons present in the outermost shell of an atom. Despite the fact that fluorine and chlorine are poisonous, small amounts are essential to human health and life. Iodine is also needed for human health.

Shells can be considered as energy levels and the further away from the nucleus the higher in energy. Yttrium is a silvery metal that has the atomic number 39 in the periodic table. It is a Transition metal and located in Group 3 of the periodic table. Technetium is a silvery-gray metal that has the atomic number 43 in the periodic table.

Fluorine belongs to the p-block element and it is present in the group 17 and period 2 of the periodic table. It is the first member of the halogen family and is the most electronegative element present. Except with noble gases, fluorine is highly reactive with other elements morgan state university population present. The electronic configuration of fluorine is given as \[122\] which can also be written as \[22\]. From the electronic configuration, we can say that the number of valence electrons present in the Fluorine is 7. Fluorine will be having an oxidation number of -1.