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Periodic Table
The Periodic Table is a tabular arrangement of the elements in increasing order oftheir atomic numbers, so that elements with similar properties are in the same column. There are 18 columns, called groups, and seven rows, which are called periods, in the modern periodic table. Questions about the Periodic Table: its history and creation, trends, groups/families, and periods are asked in our Periodic Table category.
11,356 Questions
What is the difference between 35Cl and 37Cl?
Their number of neutrons.
Chlorine 35 and Chlorine 37, What is the difference?
Basically, they are both chlorine. They are not distinguished as 2 different elements because they consist of the same number of protons. The atomic number, aka proton number, is what differs between elements.
The 2 of them are isotopes of the same element. The number 35 and 37 represents their mass number, which is the number of protons + number of neutrons. Hence, we can see that Chlorine 37 has 2 more neutrons compared to Chlorine 35.
What is different then?
Isotopes of the same element are identical. A heavier isotope might tend to react slower than a lighter one, which in this case, Chlorine 37 is the heavier one. Isotopes with more neutrons also have better nuclear stability.
Isotopes also differ in abundance in nature. Chlorine 35 has an abundance of 75.53%. As chlorine only exist in 2 isotopes, the rest of chlorine found will be Chlorine 37, meaning that it will have an abundance percentage of 24.47%.
What is the special name given to the middle 10 columns of the periodic table?
The middle 10 columns of the periodic table are known as the transition metals. These elements are characterized by their ability to form colored compounds and exhibit variable oxidation states. They are located between groups 3 to 12 on the periodic table.
Elements after which element are radioactive?
The atoms that are radioactive are those with unstable nuclei. There is no easy way to tell which is which, so the isotope has to be looked up.
All elements have at least some radioactive isotopes. There are 36 elements for which all radioactive isotopes are synthetic or fission products, so for practical purposes, there are no radioactive isotopes of them in nature, except where introduced by human activity. They include most of the common elements we find in nature, but not all.
There are 44 elements that are found as stable isotopes, but at least traces of radioactive isotopes are found in nature. Among these are hydrogen, carbon, sodium,
silicon, chlorine, and potassium, all of which are necessary for life. Radioactive potassium, in particular, is present as 0.012% of all potassium.
For another group of elements, including technetium, promethium, and all with atomic numbers of 83 (bismuth) or more, there is no isotope that is stable.
When the ionizer is turned on, voltage is applied to a set of needles inside the fan. This creates electrons that are discharged into the air. When these negatively charged particles encounter a particle of dust or smoke or animal dander, they attach to it and make it larger. This makes them either trapped in the filter of the fan or makes them fall to the floor as dust particles, which can then be swept or vacuumed up.
Which elements are used to make computer chips?
The heart and soul of computer (or most other semiconductor) chips is silicon. Very, very pure silicon. It is on a silicon substrate that the tiny amounts of other stuff is deposited to create the circuits of something like a microprocessor or a very large scale solid state memory integrated circuit. Got links if you want to check them out. The pictures alone are worth the trouble to surf on over.
Dmitri Mendeleev organized the elements by increasing atomic mass and grouped elements with similar properties together, leaving gaps for undiscovered elements. This contrasted with other chemists who arranged elements by atomic weight alone or in alphabetical order without considering their properties. Mendeleev's periodic table accurately predicted the properties of missing elements and laid the foundation for the modern periodic table.
Which element in the 3 period has 3 valence electrons?
Aluminum, element number 13. You can tell how many valence electrons an element has by looking at its group (column). This rule only applies for the metals and nonmetals, however. In other words, columns IA, IIA, (skip the middle section starting with Sc and ending with Zn) IIIA, IVA, VA, VIA and VIIA have 1, 2, 3, 4, 5, 6 and 7 valence electrons, respectively.
What does the mark A1 on table service mean?
The mark A1 on table service typically refers to the highest quality of silver-plated items. It signifies that the piece is of superior quality and is often associated with a guarantee of purity and craftsmanship. Items marked A1 are considered to be top-tier in terms of silver-plated tableware.
The element you are referring to is potassium. It has one electron in its outer shell and produces a faint purple color when excited.
What is a series of symbols representing sounds of language and arranged in an order is called?
A series of symbols representing sounds of language and arranged in a specific order is called a written language or a written text. This written form allows for communication through visual symbols that correspond to spoken language.
Why did Newlands arrange the elements in rows of seven?
Newlands arranged the elements in rows of seven to highlight a repeating pattern of chemical properties every eighth element, known as the Law of Octaves. This arrangement was an early attempt to organize the elements based on characteristics such as atomic mass.
One example of two elements that are side by side but do not follow the general melting point trend for the period are sodium (Na) and magnesium (Mg). Sodium has a lower melting point than magnesium, even though it is located to the left of magnesium on the periodic table.
Why is the symbol for integers the letter Z?
Apparently, it comes from the word "Zhalen" which is the German word for "Number". Apparently this word was chosen by N.Bourbaki, a group of mathematicians aiming to write a thorough unified account of all mathematics.
Source:
http://mathcentral.uregina.ca/QQ/database/QQ.09.01/stephanie3.html
More information on N.Bourbaki group:
http://en.wikipedia.org/wiki/Nicolas_Bourbaki
Is oxygen-18 a common isotope?
Oxygen-18 is a relatively rare isotope, making up about 0.2% of naturally occurring oxygen. It is often used in scientific research, such as studying climate history through ice cores or tracking the movement of water in the environment. Its rarity compared to the more common oxygen-16 isotope means that it can provide valuable insights in various fields.
Mendeleev used atomic masses to classify the element, where as Moseley classified the element in terms of atomic number, he suggested that chemical and physical properties are the functions of the atomic number Elements in the periodic table is classified as Metals, Nonmetal and Metalloids. Normally Group 1 to 12 are metals...
Sayed Abdul Aziem
Sayed_abd2007@hotmail.com
Why are groups on the periodic table called families?
The elements is a group on the Periodic Table are considered a family because they have similar electron configurations and similar properties.
Which shows the electron configuration of Al in noble gas notation Use a periodic table as needed?
The electron configuration of aluminum (Al) in noble gas notation is [Ne] 3s2 3p1. This notation indicates that aluminum has the same electron configuration as neon (Ne) up to the 2p orbital, followed by 3s2 3p1 for the remaining electrons in aluminum.
What does neon black look like?
Neon black is not a naturally occurring color. Neon colors typically refer to bright, highly saturated hues, while black is the absence of color. Therefore, it is not possible to create a neon version of black.
What unique element has similar properties to group 1 and 17?
Francium (Fr) has similar properties to both Group 1 (alkali metals) and Group 17 (halogens) elements. Due to its large size and single valence electron, francium shares some similarities with the alkali metals, while also having reactivity comparable to halogens due to the ease of losing its valence electron. Francium is highly reactive and is found in extremely low abundances in nature.
Was the first element on the periodic table of elements carbon?
NO!!! Hydrogen (H) is the first element on the Periodic Table.
Reason
Atomic No. = 1
Atomic mass( of protium) = 1
Carbon lies 6th position.
Atomic No. = 6
Atomic mass = 12
What chemical element on the periodic table is represented by the symbol Sr?
Strontium is the chemical element represented by the symbol Sr on the periodic table. It is a soft, silver-white alkaline earth metal that is commonly used in fireworks and in the production of cathode ray tubes.
What is the name of the scientist who first developed the periodic table?
You can mainly blame the Russian chemist Dmitri Mendeleyev (or Mendeleev, or Mendeleyef - there are many different spellings of his name.)
Back in the early 19th century, a German chemist named Johann Dobereiner noticed that some of the elements fitted naturally into groups of three, called triads, with similar chemical and physical properties. The English chemist John Newlands was the first to notice that if you arranged the elements in order of atomic mass, they seemed to have similar physical and chemical properties every eight elements. He called this the law of octaves, because the way in which these properties repeated every eight elements was similar to the way the same note was repeated every eight notes (octave) on a piano. However, at times his scheme broke down, and he realised there was something wrong with it, abandoning the octave idea. His fellow chemists mocked him for it - someone once said he'd have better luck listing the elements in alphabetical order and looking for patterns!
It was Mendeleyev who in 1859 took Newlands' idea of looking for repeated properuties in the elements, and decided to create a table of elements in increasing atomic mass. Unlike Newlands, he left gaps where the pattern did not fit, and predicted new elements would be discovered, predicting their properties from the table. These elements were subsequently discovered, and since then, Mendeleyev's periodic table has been the most useful chart in chemistry.
Is arsenic a metal non-metal or semi-metal?
Arsenic is usually classified as a metalloid. The chemistry of arsenic is predominately nonmetallic but it shows less anionic behavior than ordinary nonmetals. Liquid arsenic is a semiconductor. It can form many metal alloys but most of them are brittle.
What are the Liquid Metals on the periodic table?
The only two elements that are liquid at standard conditions(32 degrees Fahrenheit, and 1 Atmosphere pressure) are both metals, they are bromine and Mercury. Gallium melts to a liquid at just above room temperature( it melts in your hand!) but it doesn't make the cutoff
