- 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.
- David O. Sacks (Wikipedia)
David Oliver Sacks (born May 25, 1972) is a South African-American entrepreneur, author, and investor in internet technology firms. He is a general partner of Craft Ventures, a venture capital fund he co-founded in late 2017. Additionally, he is a co-host of the All In podcast, alongside Chamath Palihapitiya, Jason Calacanis and David Friedberg. Previously, Sacks was the COO and product leader of PayPal, and founder and CEO of Yammer. In 2016, he became interim CEO of Zenefits for ten months. In 2017, Sacks co-founded Craft Ventures, an early-stage venture fund. His angel investments include Facebook, Uber, SpaceX, Palantir Technologies, and Airbnb.