Selenium

Key Stage 2

Meaning

Selenium is a solid.

Key Stage 3

Meaning

The chemical symbol for Selenium.

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

Selenium can form many different molecules including Se₆, Se₇, Se₈.

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

The chemical symbol for Selenium.

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.