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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
How are materials classified on the basis of resistivity?
Materials can be classified based on their resistivity as conductors, semiconductors, or insulators. Conductors have low resistivity, allowing electric current to flow easily. Semiconductors have resistivity in between conductors and insulators, and their conductivity can be controlled. Insulators have high resistivity and do not allow electric current to flow easily.
Why is xeon the only gas in the periodic table beginning with x?
Xenon is the only gas in the periodic table that begins with the letter "X" because it is the only element with a name that starts with that letter. The names of elements are derived from various sources including Latin and Greek, and "xenon" comes from the Greek word for "stranger" or "foreigner."
Elements in the periodic table that are essential to our body?
Some essential elements found in the human body are oxygen, carbon, hydrogen, nitrogen, calcium, phosphorus, potassium, sulfur, sodium, chlorine, and magnesium. These elements are critical for various biological processes such as metabolism, energy production, and cell functions.
Nomenclature of elements in periodic table?
Sodium (Na) Natrium
Copper (Cu) Cuprum
Lead (Pb) Plumbrum
Tungsten (W) Wolfrum
Iron (Fe) Ferrum
Tin (Sn) Stannum
Potassium (K) Kalium
Gold (Au) Aurum
Mercury (Hg) Hydragyrum
Silver (Ag) Argentum
The Relative Mass (Ar) of carbon is 12. The Relative mass can be found very easily, it is the top number of the electron in the periodic table.
What element in Group 2 is most likely to lose an electron?
The elements in Group 2, which are the Alkaline earth metals. want to lose two electrons, and not just one. It is the elements of Group 1 in the periodic table, the Alkali metals, that want to lose a single electron.
In any case, the elements of these groups that most want to lose an electron (Group 1) or two (Group2) are found at the bottom of those groups. (There is one exception, and we'll get to that.) In general, reactivity increases as we look down the groups on the left side of the periodic table. In the case of Group 1, which is composed of lithium, sodium, potassium, rubidium, caesium and francium, it is caesium that is the most reactive. That's the exception to the rule, as francium, which is farther down the group, is a bit less reactive than caesium. The element caesium wants to lose an electron more than any of the other elements in that group. In the case of the Group 2 elements, which include beryllium, magnesium, calcium, strontium, barium and radium, it is radium that is most reactive. And it is radium that wants to lose two electrons more than any other element in that group.
What is vertical stratification in aquatic biomes?
Prefundal zone is the deep middle where no light can reach.
*not all lakes have prefundal zones, some are too shallow*
Marine - Epipelagic - [receives light]
Mesopelagic - [receives light]
Bathypelagic - [the top of which receives light, the bottom does not]
Abyssopelagic - [no light]
Hadalpelagic - [no light]
hope this helps
Did overhead door corporation buy Wayne Dalton?
Yes, Overhead Door Corporation did buy Wayne-Dalton!
On December 7, 2009 Overhead Door Corporation completed its acquisition of Wayne-Dalton's residential and commercial door business, as well as their Fabric-Shield storm panel business.
You can read more about this on both websites:
http://www.overheaddoor.com/Wayne-Dalton-news.aspx
http://www.wayne-dalton.com/wayne-dalton_news.html
When moving down a group in the periodic table what does the number of valence electrons do?
The number of valence electrons increases by one as you move down a group in the periodic table. Valence electrons are the electrons in the outermost energy level of an atom, and they determine the chemical properties of an element.
Is the buffer supposed to keep the pH of a solution at 7?
A buffer solution is designed to resist changes in pH when small amounts of acids or bases are added. It can help maintain the pH within a specific range, but it is not necessarily set to maintain a pH of 7. The specific pH range depends on the components of the buffer solution.
What does the melting-point in non-metals generally do as you go down a group in the periodic table?
this is because there are more electrons in the atom leading to greater van der waals forces, also larger atom so larger electron cloud, and again greater van der waals. so key thing is van der waals increases and this means stronger forces and greater melting point this is because there are more electrons in the atom leading to greater van der waals forces, also larger atom so larger electron cloud, and again greater van der waals. so key thing is van der waals increases and this means stronger forces and greater melting point
Which two atoms will have their outer energy level filled with 2 electrons?
Helium (He) and Neon (Ne) will both have their outer energy level filled with 2 electrons.
What happens when calyx powder is heated?
When calyx powder is heated, it might lose its color, flavor, and some of its nutritional properties due to the breakdown of compounds like anthocyanins and antioxidants. High heat can also destroy some of the beneficial enzymes present in the calyx powder.
Names and symbols and elements having atomic number 1 to 20?
- Hydrogen (H)
- Helium (He)
- Lithium (Li)
- Beryllium (Be)
- Boron (B)
- Carbon (C)
- Nitrogen (N)
- Oxygen (O)
- Fluorine (F)
- Neon (Ne)
- Sodium (Na)
- Magnesium (Mg)
- Aluminum (Al)
- Silicon (Si)
- Phosphorus (P)
- Sulfur (S)
- Chlorine (Cl)
- Argon (Ar)
- Potassium (K)
- Calcium (Ca)
Why nitrogen have less tendency to form catenation than phosphorus?
The reason for this lies in the bond dissociation enthalpy of Nitrogen molecule,
The two atoms are bonded by a triple bond whose enthalpy is 941.4 KJ mol-1 .
So the two atoms are not very free to bond with others
Not only this, the higher tendency of P to form catenation is its bigger size than N
which makes the bond cleavage with other atoms easy.
What is the nuclear equation for the beta decay of no-260?
Nobelium-260, formally 102260No, does not decay by beta decay. It decays by spontaneous fission with a half life of 106 milliseconds. For further information, please see the Related Link below.
What is the nuclear equation for lead 209 undergoing beta decay?
Lead-209 undergoes beta- decay to become Bismuth-209
82209Pb --> 83209Bi + -10e + v-e
emitting an electron and an electron antineutrino.
What is the basis for the arrangement of elements in the periodic table?
The short answer is order. Elements are grouped in a table according to similarities in electron structure, atomic composition, the number of protons / neutrons / electrons. This also then naturally groups them by similar properties, metallic / nonmetallic, electronegativity, etc. Periods (columns) group by number of valence (outer shell) electrons.
the basis of arrangement of element in a periodic table is based on the increasing proton number of the elements.
Why does metal oxidation increase weight?
It depends on the metal. If it is higher up the reactivity series then it will react with the metal. This is called oxidising. If it is very reactive, for example Lithium, it will react more fiercely and burn, giving of a bright light.
Name the elements with highest ionisation enthalpy?
The elements with the highest ionization enthalpy are helium, neon, and argon. These noble gases have full valence electron shells and are very stable, making it difficult to remove an electron from them.
Which of these are the correct element for metal li si s?
- Li - Lithium is a metal
- Si - Silicon is a metalloid, a semiconductor
- S - Sulfur is a nonmetal
As you move across a period from left to right in the periodic table, the atomic number of the elements increases by one with each element. Electronegativity also increases across a period from left to right due to the increasing nuclear charge and decreasing atomic radius, which results in stronger pull on electrons.
Why do metals in Group 1 get more reactive nearer the bottom of the Group?
The reactivity of an element largely depends on its electronic configuration. All the 1st group elements have one electron each in the outer most s-orbital. Their reactivity is due to the loss of this electron and formation of a uni positive ion. The ease with which the element loses the electron dictates its activity. As we go down the group, the distance between the outer most orbital and nucleus increases and hence the ease with which the element loses the electron increases as we go down the group. So naturally the reactivity increases.
However in the case of 7th group elements(halogens) the electronic configuration is s2p5. They acquire stability by acquiring another electron. This is called electron affinity. This increases as we go up a group. So we find the more reactive element at the top of the group.
We can generalize this like this. The reactivity of an element depends on the ease with which it acquires the nearest iner gas electronic configuration.
