Fact to remember | Name of the element |
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An element is defined by the IUPAC as a pure chemical substance composed of atoms with the same number of protons in the atomic nucleus. All atoms of an element have the same number of protons. | |
Atoms of elements can have different number of electrons and neutrons. | |
A variant of an element with different number of neutrons is known as its | Isotope |
Different physical form of an element is known as its (e.g. graphite and diamond) | Allotrope |
Element most abundant in the Universe | Hydrogen |
Element most abundant in the human body | Oxygen |
Element which forms more than 10 million compounds | Carbon |
Element with the lowest melting and boiling point | Helium |
Element with the highest melting point | Carbon |
Element with the highest boiling point | Tungsten |
Element with highest density | Osmium |
Element with lowest density | Hydrogen |
Element with highest electronegativity | Flourine |
Element with lowest electronegativity (highest electropositivity) | Francium |
The first element to be produced artificially | Technitium |
The most corrosion resistant element (which cannot be affected by water, chemicals or acids) | Iridium |
The element which was discovered on the Sun before it was found on the Earth | Helium |
The non-metallic element which is liquid at room temperature | Bromine |
The metallic element which is liquid at room temperature | Mercury |
The most reactive element | Flourine |