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Because of its reactivity with water, lithium is usually stored in a hydrocarbon sealant, often petroleum jelly.
Though the heavier alkali metals can be stored in more dense substances, such as mineral oil, lithium is not dense enough to be fully submerged in these liquids.
Lithium cannot be stored in kerosene oil , because it is the lightest metal and it floats on its surface and react with air .
Therefore it is kept wrapped in paraffin wax.

International Union of Pure and Applied Chemistry, the standards body that among other things, makes recommendations regarding the names of newly discovered elements and establishes other chemistry related standards

The international headquarters office of the IUPAC is located in Zurich, Switzerland.

Motto of IUPAC is ‘Advancing Chemistry Worldwide’

The United Nations General Assembly during its 74th Plenary Meeting proclaimed 2019 as the International Year of the Periodic Table of Chemical Elements on 20 December 2017. Based on the 202 EX/Decision 43, the IYPT2019 was adopted by the UNESCO General Conference at its 39th Session.
It is to highlight the first publication of Periodic Table.
Dmitri Ivanoich Mendeleev Tabulated the elements in his Periodic Table in 1869.
In 2019, it marks the 150 anniversary of the first publication of periodic table by Mendeleev.

The halogens are five non-metallic elements found in group 17 of the periodic table. The term “halogen” means “salt-former” and compounds containing halogens are called “salts”.

Cesium 133 is the element most commonly chosen for atomic clocks. The operation of a cesium-beam atomic clock is based on the transition between two states in the cesium atom. Rubidium is also used in atomic clocks, and it lowers the cost; however, rubidium clocks are less stable.
Element used to make engine parts of Aircraft- Titanium.
Elements used as electrodes in a dry cell- Zinc. carbon.

Heat can be transferred from one place to another by three methods: conduction in solids, convection of fluids (liquids or gases), and radiation through anything that will allow radiation to pass. The method used to transfer heat is usually the one that is the most efficient.

At higher altitudes, say like mountains, cooking food is difficult. Higher altitudes mean lower atmospheric pressure and thus lower boiling point. So, at higher altitude, food needs to be cooked for a longer time due to the lower in the boiling point of water.

The stamen (plural stamina or stamens) is the pollen-producing reproductive organ of a flower. Collectively the stamens from the androecium.

Around 53 elements were discovered at the time of Dobereiner triads.
Dobereiner could classify only three such triads of (Ca, Sr, Ba) ; (Li, Na, K) and (Cl, Br, I).
Law of Triads: According to Dobereiner, when elements are arranged in increasing order of their atomic masses, the arithmetic mean of the atomic masses of the first and third element in a triad is approximately equal to the atomic mass of the second element in that triad.

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