- Bram Stoker (Wikipedia)
Abraham Stoker (8 November 1847 – 20 April 1912) was an Irish author who is best known for writing the 1897 Gothic horror novel Dracula. During his lifetime, he was better known as the personal assistant of actor Sir Henry Irving and business manager of the West End’s Lyceum Theatre, which Irving owned.
- Ionic compound (Wikipedia)
In chemistry, an ionic compound is a chemical compound composed of ions held together by electrostatic forces termed ionic bonding. The compound is neutral overall, but consists of positively charged ions called cations and negatively charged ions called anions. These can be simple ions such as the sodium (Na+) and chloride (Cl−) in sodium chloride, or polyatomic species such as the ammonium and carbonate ions in ammonium carbonate. Individual ions within an ionic compound usually have multiple nearest neighbours, so are not considered to be part of molecules, but instead part of a continuous three-dimensional network. Ionic compounds usually form crystalline structures when solid.