Facts about Elements

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 itsIsotope
Different physical form of an element is known as its (e.g. graphite and diamond)Allotrope
Element most abundant in the UniverseHydrogen
Element most abundant in the human bodyOxygen
Element which forms more than 10 million compoundsCarbon
Element with the lowest melting and boiling pointHelium
Element with the highest melting pointCarbon
Element with the highest boiling pointTungsten
Element with highest densityOsmium
Element with lowest densityHydrogen
Element with highest electronegativityFlourine
Element with lowest electronegativity (highest electropositivity)Francium
The first element to be produced artificiallyTechnitium
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 EarthHelium
The non-metallic element which is liquid at room temperatureBromine
The metallic element which is liquid at room temperatureMercury
The most reactive elementFlourine


Select the right answer

1. Which element has the highest density?

2. Which is the most electronegative element?

3. Graphite and Diamond are

4. Which is the most abundant element in Universe?

5. Isotopes differ in number of -

6. Which element has the highest boiling point?

7. Which of the following is liquid at room temperature?