In chemistry, an element is a pure substance consisting only of atoms that all have the same numbers of protons in their nuclei. Unlike chemical compounds, chemical elements cannot be broken down into simpler substances by any chemical reaction. The number of protons in the nucleus is the defining property of an element, and is referred to as its atomic number – all atoms with the same atomic number are atoms of the same element. All of the baryonic matter of the universe is composed of chemical elements. When different elements undergo chemical reactions, atoms are rearranged into new compounds held together by chemical bonds. Only a minority of elements, such as silver and gold, are found uncombined as relatively pure native element minerals. Nearly all other naturally occurring elements occur in the Earth as compounds or mixtures. Air is primarily a mixture of the elements nitrogen, oxygen, and argon, though it does contain compounds including carbon dioxide and water.
The House of Commons is the lower house and de facto primary chamber of the Parliament of the United Kingdom. Like the upper house, the House of Lords, it meets in the Palace of Westminster.
Judaism is an Abrahamic, monotheistic, and ethnic religion comprising the collective religious, cultural, and legal tradition and civilization of the Jewish people. It has its roots as an organized religion in the Middle East during the Bronze Age. Modern Judaism evolved from Yahwism, the religion of ancient Israel and Judah, by around 500 BCE, and is thus considered to be one of the oldest monotheistic religions. Judaism is considered by religious Jews to be the expression of the covenant that God established with the Israelites, their ancestors. It encompasses a wide body of texts, practices, theological positions, and forms of organization.
In chemistry, organic compounds are generally any chemical compounds that contain carbon-hydrogen bonds. Due to carbon's ability to catenate, millions of organic compounds are known. The study of the properties, reactions, and syntheses of organic compounds comprise the discipline known as organic chemistry. For historical reasons, a few classes of carbon-containing compounds, along with a few other exceptions, are not classified as organic compounds and are considered inorganic. Other than those just named, little consensus exists among chemists on precisely which carbon-containing compounds are excluded, making any rigorous definition of an organic compound elusive.
The periodic table, also known as the periodic table of (the) (chemical) elements, is a tabular display of the chemical elements. It is widely used in chemistry, physics, and other sciences, and is generally seen as an icon of chemistry. It is a graphic formulation of the periodic law, which states that the properties of the chemical elements exhibit a periodic dependence on their atomic numbers.
Claudius Ptolemy was a mathematician, astronomer, astrologer, geographer, and music theorist, who wrote about a dozen scientific treatises, three of which were of importance to later Byzantine, Islamic, and Western European science. The first is the astronomical treatise now known as the Almagest, although it was originally entitled the Mathēmatikē Syntaxis or Mathematical Treatise, and later known as The Greatest Treatise. The second is the Geography, which is a thorough discussion on maps and the geographic knowledge of the Greco-Roman world. The third is the astrological treatise in which he attempted to adapt horoscopic astrology to the Aristotelian natural philosophy of his day. This is sometimes known as the Apotelesmatika but more commonly known as the Tetrábiblos, from the Koine Greek meaning "Four Books", or by its Latin equivalent Quadripartite.
The Solar System is the gravitationally bound system of the Sun and the objects that orbit it. Of the bodies that orbit the Sun directly, the largest are the four gas and ice giants and the four terrestrial planets, followed by an unknown number of dwarf planets and innumerable small Solar System bodies. Of the bodies that orbit the Sun indirectly—the natural satellites—two are larger than Mercury and one is nearly as large.
The tarot is a pack of playing cards, used from at least the mid-15th century in various parts of Europe to play games such as Italian tarocchini, French tarot and Austrian Königrufen, many of which are still played today. In the late 18th century, some tarot decks began to be used for divination via tarot card reading and cartomancy leading to custom decks developed for such occult purposes.
Many types of wrestling matches, sometimes called "concept" or "gimmick matches" in the jargon of the business, are performed in professional wrestling. Some gimmick matches are more common than others and are often used to advance or conclude a storyline. Throughout professional wrestling's decades long history, some gimmick matches have spawned many variations of the core concept.
Solipsism is the philosophical idea that only one's mind is sure to exist. As an epistemological position, solipsism holds that knowledge of anything outside one's own mind is unsure; the external world and other minds cannot be known and might not exist outside the mind.
The Grand Slam in tennis is the achievement of winning all four major championships in one discipline in the same calendar year, also referred to as the "Calendar-year Grand Slam" or "Calendar Slam". In doubles, a team may accomplish the Grand Slam playing together or a player may achieve it with different partners. Winning all four major championships consecutively but not within the same calendar year is referred to as a non-calendar-year Grand Slam, while winning the four majors at any point during the course of a career is known as a Career Grand Slam.
The Rajya Sabha, constitutionally the Council of States is the upper house of the bicameral Parliament of India. As of 2021 it has a maximum membership of 245, of which 233 are elected by the legislatures of the states and union territories using single transferable votes through Open Ballot while the President can appoint 12 members for their contributions to art, literature, science, and social services. The potential seating capacity of the Rajya Sabha is 250, according to article 80 of the Indian Constitution. Members sit for staggered terms lasting six years, with about a third of the 233 designates up for election every two years, in even-numbered years. The Rajya Sabha meets in continuous sessions, and unlike the Lok Sabha, being the lower house of the Parliament, the Rajya Sabha is not subjected to dissolution. However, the Rajya Sabha, like the Lok Sabha can be prorogued by the President.
The Governor-General of India was the representative of the Monarch of the United Kingdom and after Indian independence in 1947, the representative of the Indian head of state. The office was created in 1773, with the title of Governor-General of the Presidency of Fort William. The officer had direct control only over Fort William but supervised other East India Company officials in India. Complete authority over all of India was granted in 1833, and the official came to be known as the "Governor-General of India".
Makara/Makar Sankranti or Uttarayan or Maghi or simply Sankranti, also known in Bangladesh and West Bengal as Poush Sankranti, and in Nepal as Maghe Sankranti, 'Sankranti' here means ‘transfer’, this day is considered as the transition day of Sun into Capricorn. Now the sun moves northwards in the Hindu calendar, dedicated to the deity Surya (sun), many native multi-day festivals are organised all over India. It is observed each year the day Sun enters the Capricorn zodiac which corresponds with the month of January as per the Gregorian calendar. It marks the first day of the sun's transit into Makara rashi (Capricorn).
The Greek alphabet has been used to write the Greek language since the late ninth or early eighth century BC. It is derived from the earlier Phoenician alphabet, and was the earliest known alphabetic script to have distinct letters for vowels as well as consonants. In Archaic and early Classical times, the Greek alphabet existed in many local variants, but, by the end of the fourth century BC, the Euclidean alphabet, with twenty-four letters, ordered from alpha to omega, had become standard and it is this version that is still used for Greek writing today.
The Egyptian pyramids are ancient masonry structures located in Egypt. Sources cite at least 118 identified Egyptian pyramids. Most were built as tombs for the country's pharaohs and their consorts during the Old and Middle Kingdom periods.
1080i is a combination of frame resolution and scan type. 1080i is used in high-definition television (HDTV) and high-definition video. The number "1080" refers to the number of horizontal lines on the screen. The "i" is an abbreviation for "interlaced"; this indicates that only the odd lines, then the even lines of each frame are drawn alternately, so that only half the number of actual image frames are used to produce video. A related display resolution is 1080p, which also has 1080 lines of resolution; the "p" refers to progressive scan, which indicates that the lines of resolution for each frame are "drawn" on the screen in sequence.
Isotopes are two or more types of atoms that have the same atomic number and position in the periodic table, and that differ in nucleon numbers due to different numbers of neutrons in their nuclei. While all isotopes of a given element have almost the same chemical properties, they have different atomic masses and physical properties.
