- Africa (Wikipedia)
Africa is the world’s second-largest and second-most populous continent after Asia. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 20% of Earth’s land area and 6% of its total surface area. With 1.4 billion people as of 2021, it accounts for about 18% of the world’s human population. Africa’s population is the youngest amongst all the continents; the median age in 2012 was 19.7, when the worldwide median age was 30.4. Despite a wide range of natural resources, Africa is the least wealthy continent per capita and second-least wealthy by total wealth, ahead of Oceania. Scholars have attributed this to different factors including geography, climate, tribalism, colonialism, the Cold War, neocolonialism, lack of democracy, and corruption. Despite this low concentration of wealth, recent economic expansion and the large and young population make Africa an important economic market in the broader global context.
- Benin (/bɛˈniːn/ ben-EEN, /bɪˈniːn/ bin-EEN; French: Bénin [benɛ̃], Fon: Benɛ, Fula: Benen), officially the Republic of Benin (French: République du Bénin), and also known as Dahomey, is a country in West Africa. It is bordered by Togo to the west, Nigeria to the east, Burkina Faso to the North-west, and Niger to the North-east. The majority of its population lives on the southern coastline of the Bight of Benin, part of the Gulf of Guinea in the northernmost tropical portion of the Atlantic Ocean. The capital is Porto-Novo, and the seat of government is in Cotonou, the most populous city and economic capital. Benin covers an area of 114,763 km2 (44,310 sq mi), and its population in 2021 was estimated to be approximately 13 million. It is a small, tropical country. It is one of the least developed, with an economy heavily dependent on agriculture, and is an exporter of palm oil and cotton. Some employment and income arise from subsistence agriculture.
- 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.
