| Fact to remember | Name of the element |
|---|---|
| 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 |
Element Electrons Electronic Configuration Hydrogen (H) 1 1s 1 Helium (He) 2 1s 2 Lithium (Li) 3 1s 2 2s 1 Beryllium (Be) 4 1s 2 2s 2 Boron (B) 5 1s 2 2s 2 2p 1 Carbon (C) 6 1s 2 2s 2 2p 2 Nitrogen (N) 7 1s 2 2s 2 2p 3 Oxygen (O) 8 1s 2 2s 2 2p 4 Fluorine (F) 9 1s 2 2s 2 2p 5 Neon (Ne) 10 1s 2 2s 2 2p 6 Sodium (Na) 11 1s 2 2s 2 2p 6 3s 1 Magnesium (Mg) 12 1s 2 2s 2 2p 6 3s 2 Aluminum (Al) 13 1s 2 2s 2 2p 6 3s 2 3p 1 Silicon (Si) 14 1s 2 2s 2 2p 6 3s 2 3p 2 Phosphorous (P) 15 1s 2 2s 2 2p 6 3s 2 3p 3 Sulfur (S) 16 1s 2 2s 2 2p 6 3s 2 3p 4 Chlorine (Cl) 17 1s 2 2s 2 2p 6 3s 2 3p 5 Argon (Ar) 18 1s 2 2s 2 2p 6 3s 2 3p 6 Potassium (K) 19 1s 2 2s 2 2p 6 3s 2 3p 6 4s 1 Calcium (Ca) 20 1s 2 2s 2 2p 6 3s 2 3...
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