Periodic table

3. is the amount of a substance usually represented as a percentage
4. structure is the structure of the atom. When we examine the atom it is made up of smaller parts called sub atomic particles.
5. particle An alpha particle is a product of nuclear decay released by some radioactive elements. Made of two protons and two neutrons with a mass of 4. A large particle but slow moving and is easily stopped by air
7. Earth Metals Alkaline earth metals is the second most reactive group of elements in the periodic table. They are found in group 2 of the periodic table (formally known as group IIA).
8. (Al) is a silver coloured metal often tarnished by oxidation that has the atomic number 13 in the periodic table. It is in Group 13 of the periodic table. It has the symbol Al.
10. An alchemist is the term given to a scientist who practiced the investigation of materials and changing of elements but not using very scientific techniques.
12. the distance measured from the nucleus to the outer valence electrons

1. is a silvery-white soft metal that has the atomic number 20 in the periodic table.
2. Metal The alkali metals, found in group 1 of the periodic table (formally known as group IA), are so reactive that they are generally found in nature combined with other elements. The alkali metals are shiny, soft, highly reactive metals at standard temperature and pressure.
3. Zero Absolute zero is the temperature measured in kelvin, a temperature where in theory atoms will have no kinetic energy
5. are elements from the atomic number 89 to 103 largely forming the F block of elements in the extended periodic table. They are mostly radioactive
6. An atom is the smallest particle that makes up all matter
9. (At) is a radioactive non-metal that has the atomic number 85 in the periodic table in Group 17
11. Structure
13. exists as several allotropes, most commonly as Diamond or the gray-black solid Graphite.
14. An anion is a negatively charged particle