Contents
Key Stage 2
Key Stage 3
Meaning
Selenium is a Group 5 non-metal element, on the Periodic Table, with an atomic number of 34.
About Selenium
- Selenium has the chemical symbol Se.
Molecular Structure
Atomic Structure
- Selenium has 34 protons and 45 neutrons in its nucleus giving it an atomic number of 34 and a atomic mass of 79.
- Selenium is in Period 4 of the Periodic Table because it has 4 electron shells.
Properties
- The different types of Selenium molecule are all solid at room temperature.
Key Stage 4
Meaning
Selenium is a Group 5 non-metal element, on the Periodic Table, with 34 protons in the nucleus.
About Selenium
- Selenium has the chemical symbol Se.
Molecular Structure
- Selenium can form many different molecules including Se6, Se7, Se8.
- Selenium forms a covalent bond with 2 other Selenium atoms to produce a simple covalent molecule.
Atomic Structure
- The most common stable isotope of Selenium has 45 neutrons in its nucleus giving it an atomic mass of 79.
- Selenium is in Period 4 of the Periodic Table because it has 4 electron shells.
- Selenium has 6 electrons in its outer shell and needs 2 more electrons to get a full outer shell so it can form 2 bonds with other atoms.
Properties
- The different allotropes of Selenium are all solid at room temperature.