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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 grade level teaches the periodic table of the elements?
You should learn the Periodic Table whenever you take Chemistry in high school. Most people are a sophomore in high school when taking chemistry.
What are some characteristics of iodine?
Iodine is a chemical element that is essential for the production of thyroid hormones, which regulate metabolism. It is commonly used as a disinfectant and antiseptic due to its ability to kill bacteria and other pathogens. Iodine is also important for maintaining healthy skin, hair, and nails.
Elements in the same group have similar properties because they have the same?
the same number of electrons needed to fill their octet,
the same number of valence electrons,
What is a group in the peirodic table?
A group in the periodic table is a column of elements that share similar chemical properties due to having the same number of electrons in their outermost energy level (valence electrons). There are 18 groups in the periodic table, each denoted by a number and/or letter indicating the number of valence electrons for the elements in that group.
What would be the enemy or opposite of the element Sodium?
The opposite of sodium would be an element like chlorine. Sodium is a reactive metal, while chlorine is a non-metal with a high electronegativity. When combined, sodium and chlorine form a stable compound known as sodium chloride (table salt).
In what year was aurum discovered?
The identity of the discoverer and the identification of the exact place and time of the discovery are unknown. For aurum, which is the Latin name for gold, has been known since prehistoric times. It's thought to be one of the first metals to have been used by Earth dwellers of pre-recordedhistory. For two of its attractions always have been the beautiful purity of its color, and the cooperation that it lends to workmanship. What is known is the knowledge and use of gold by the time that the holy Old Testament book of Genesis was written. For chapter 2 verse 11 mentions the gold in the land of Havilah. Likewise, gold was known and being used by 2600 B.C., when Egyptian hieroglyphics contained the boast of Egypt as having more gold than dirt.
Why was the first atomic bomb named the little boy?
The nickname of the first atomic bomb (the one set off in the Trinity test) was "the gadget".
Little Boy was the first atomic bomb designed but the one detonated; it was the one detonated over Hiroshima (so it was the first one anyone outside the Manhattan Project knew about). Little Boy was called that because of its shape: Fat Man (the third bomb, detonated over Nagasaki) and the gadget were nearly spherical, but Little Boy had a slim roughly cylindrical shape.
The reason the bombs had different shapes was that they were based on different technology. Little Boy used enriched uranium, which allowed for a simpler design but was harder to obtain than the plutonium used in the other devices (plutonium could be produced in breeder reactors from the more common isotope uranium-238, and it's much easier to separate two elements than to separate two isotopes of the same element).
The original plan was to use uranium for all the bombs, but the schedule only allowed time to produce enough enriched uranium for one. Rather than wait for more, they decided to try plutonium instead, and plan B was to make the same kind of bomb but with plutonium. However, testing revealed that wouldn't work: the plutonium started to go prompt-critical too quickly, and it was thought likely that the simple gun-target model used in the slimmer bomb would "fizzle" (go off too soon, with a much weaker explosion) if plutonium was used.
Enter plan C: instead of taking two big pieces of plutonium and shooting one at the other (using a conventional explosive), they took a bunch of pieces and shot them all together at the center. This kept the plutonium below critical mass longer and allowed time for all the plutonium to be assembled before prompt criticality started. However, the design was larger and more complicated and they weren't sure it would even work, hence the Trinity test (the Little Boy design wasn't even tested, at least not as a full-scale assembled bomb; the scientists involved were so sure it would work they didn't consider it necessary to test first).
What information did Mendeleev use to try to find a pattern in elements?
Mendeleev arranged elements based on their atomic weights and chemical properties. He noticed that when he arranged elements in order of increasing atomic weight, certain properties repeated at regular intervals, leading to the development of the periodic table.
What is the minimum number of elements in a molecule?
You are mixing up your terminology. An element is made up of atoms, which can also be called molecules. However atoms usually refers to the discrete particles that make up an element (i.e. a Hydrogen atom has 1 proton and 1 electron) and molecule refers to the structural units that may make up a particular substance (i.e. a glucose molecule has 6 carbon, 12 hydogen and 6 oxygen atoms).
The smallest atom would be the hydrogen atom, with 1 proton and 1 electron. BTW protons and electrons are subatomic particles, not generally refered to as atoms or molecules.
Indentify A main group element in period 3 that has p orbitals half filled with electrons?
One main group element in period 3 that has p orbitals half-filled with electrons is phosphorus. Phosphorus has five valence electrons in its outer shell, occupying three of the available p orbitals with one electron in each.
Is irdium a metal or non metal?
Iridium is a metal. It is a dense, silvery-white transition metal commonly used in various industrial applications, such as in spark plugs and in the production of high-temperature crucibles.
What periodic elements always come with a partner?
I am not sure entirely what you mean but there are lots of elements that go around in pairs, e.g hydrogen, oxygen, nitrogen amongst others.
What are the elements in CdOCl2?
The elements in CdOCl2 are cadmium (Cd), oxygen (O), and chlorine (Cl).
What percentage of the first 36 elements in the periodic table are metals?
50% of the first 36 elements in the table are metals. 18 metals 9 non-metals (25%) and 9 (25%)gasses which are also non-metals.
Yellow gas highly dangerous to handle toxic in low doses?
The description matches hydrogen sulfide gas, which is colorless but can appear yellow when impurities are present. Hydrogen sulfide is highly toxic, and even low doses can be fatal. Extreme caution should be taken when handling this gas, as exposure can lead to serious health effects.
1s22s22p63s23p64s23d7 is in what group and what period?
The electron configuration 1s22s22p63s23p64s23d7 corresponds to the element Manganese (Mn), which is in Group 7 (previously known as "VIIIB" or "8") and Period 4 of the periodic table.
Which element has the 1s22s22p63s23p64s23d8 electron configuration?
Nickel has the atomic number 28 so it has the electron configuration 1s22s22p63s23p64s23d8 .
Who put together the first periodic table?
Dmitri Mendeleev is credited with putting together the first periodic table in 1869. Mendeleev arranged the elements based on their atomic mass, and left gaps for undiscovered elements which he predicted would fill those spaces.
Which group occupies the large middle section of the periodic table?
The transition metals occupy the large middle section of the periodic table. They are known for their characteristic properties like high melting points, variable oxidation states, and the ability to form colored compounds. They include elements like iron, copper, and zinc.
What is the alpha decay equation for polonium-218?
When a polonium-216 nucleus undergoes alpha decay, it will lose an alpha particle, which is made up of 2 protons and 2 neutrons. This means that polonium-216, which has an atomic mass of 216 and an atomic number of 84, will become the element with the atomic number of 82 (84 minus 2), and will have an atomic mass of 212 (216 minus 4). Lead has an atomic number of 82. So, this is how polonium-216 becomes an isotope of lead when it emits an alpha particle.
What are the name of elements 57-70 on the periodic table?
These elements are the lanthanides; see the link below for some details.
Using the periodic chart indicate the most common charge of elements?
The most common charges for elements on the periodic table are +1, +2, +3, -1, and -2. This is determined by the number of electrons an element gains or loses to achieve a stable electron configuration.
What is the mass of one electron is about equal to?
The mass of one electron is about 9.11E-31 kg. That's 0.000000000000000000000000000000911 kg. 911 billionths of a trillionth of a trillionth kg.
