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A mnemonic is a memory aid used to improve long-term memory and make the process of consolidation easier. Many chemistry aspects, rules, names of compounds, sequences of elements, their reactivity, etc., can be easily and efficiently memorized with the help of mnemonics.
118 chemical elements have been identified and named officially by IUPAC.A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z).
Chemistry is the scientific study of the properties and behavior of matter. [1] It is a physical science within the natural sciences that studies the chemical elements that make up matter and compounds made of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during reactions with other substances.
This section contains 21 articles. Periodic table () . Block (periodic table) Group (periodic table) Period (periodic table) Atomic mass () . Mass number; Relative atomic mass
Primary school teaching in Italy consists of 5 grades. Before the First Grade, there is the kindergarten (scuola dell'infanzia in Italian), which is not compulsory and lasts 3 years. First grade (6–7 years) Second grade (7–8 years) Third grade (8–9 years) Fourth grade (9–10 years) Fifth grade (10–11 years)
The numbers 200-900 would be confused easily with 22 to 29 if they were used in chemistry. khīlioi = 1000, diskhīlioi = 2000, triskhīlioi = 3000, etc. 13 to 19 are formed by starting with the Greek word for the number of ones, followed by και (the Greek word for 'and'), followed by δέκα (the Greek word for 'ten').