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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
Which of the following elements has the MOST metallic character Na Mg Al K Cs?
Cs (cesium) has the most metallic character among the elements listed because it is the farthest down and to the left on the periodic table. This means it has the largest atomic radius and the lowest ionization energy, both of which are associated with metallic character.
Which element pf the 4th period has highest ionisation energy?
krypton because it is an inert/noble gas, which means it has a complete outer shell and takes a lot of energy to remove an electron.
What longest word made from the periodic table?
NONRePReSeNTaTiONaLiSm From N O N Re P Re Se N Ta Ti O Na Li Sm (assuming that the symbols can be repeated).
IrReSPONSiBILiTiEs is the longest word that can be spelt entirely using chemical symbols without reusing any element.
Is floride a metal or a non metal?
Fluoride is the ion formed by the element fluorine, which is a non-metal.
Is floride a non metal or a metal?
Fluorine is a non-metal in the periodic table. It is a highly reactive element that exists as a diatomic molecule in its natural form. It is corrosive and can form compounds with almost all other elements.
Which has higher electronegativity the right side of the periodic table or left?
The right side of the periodic table has higher electronegativity compared to the left side. Elements on the right side have a greater ability to attract electrons towards themselves in a chemical bond. This trend increases as you move from left to right across a period.
What is a period on the periodio table?
A period on the Periodic Table is another name for the row that an element is on.
What element has mass number of 42 and atomic number of 20?
Neon (Ne) has atomic number 10 with 10 protons in the nucleus (that's why, you know) and, where the atomic mass is round 20 (Standard atomic weight 20.1797), the most abundant isotope (90%) is 20Ne with atomic mass number 20, which means that there are 20 particles (=protons+neutrons) in this nucleus, thus also 10 neutrons.
Yes, the information given in each element box of the periodic table is relevant to its position in the table. This information typically includes the element's atomic number, symbol, name, atomic mass, and electron configuration, which are all characteristic of that element and help to organize it within the table based on its properties and characteristics.
What are three elements in the first family?
Lithium, sodium and potassium are all in the first family.
Why is the valency of sulphate and sulphite same?
Coincidence! the oxidation number of sulfur in sufate is +6, in sulfite is +4. Sulfate is SO42-, sulfite is SO32- Personally I do not like using the word valency in this context, valency usually refers to elements- and is the number of bonds that an elemnt can form to other elemnts- it is an old term. In the context of ions charge seems to be a better word.
What does ga mean on the periodic table?
Ga stands for Gallium . It is present in group-13 of the periodic table.
How many elements occur in each of the first three periods or the periodic table?
There are 2 elements in the first period, 8, 8 elements in 2nd and 3rd periods respectively,
What does Ge stand for on the periodic table?
The symbol Ge indicates the element germanium, atomic number 32, a lustrous, hard, grayish-white metalloid (having properties of both metals and non-metals) Like silicon, it is a semiconductor material in the carbon group (group 14).
Germanium has five naturally occurring isotopes ranging in atomic mass number from 70 to 76. It forms a large number of organometallic compounds, including tetraethylgermane and isobutylgermane.
What is the periodic table mostly made up of what elements?
Every element is composed of atoms, all with the same number of protons. The elements are distinguished by the unique number of protons in each of the nuclei of its atoms.
What volume of Hydrogen chloride gas is produced by 40cm3 of chlorine with hydrogen?
It is necessary first to determine how many moles of chlorine there are in the volume specified. Using the ideal gas law, 40 cm3 of chlorine is equivalent to 0.129 grams of Cl2, or 3.63 millimoles. Next, the stoichiometric equation is set up. X H2 + Y Cl2 -- reacts --> Z HCl. It can be clearly seen that X = 1, Y = 1, and Z = 2. This means that for every mole of chlorine that reacts, 2 moles of hydrogen chloride is produced. Then, we have 7.26 millimoles of HCl. Reversing the ideal gas law, this means the resulting volume of HCl gas is .224 cm3. The reason for the smaller volume is due to the differences in the molar weight of chlorine and hydrogen chloride (70.906 g/mol and 36.461 g/mol respectively).
How did Johann dobereiner contribute to the atomic theory?
Jöns Jacob Berzelius was a Swedish chemist. He worked out the modern technique of chemical formula notation, and is considered a father of modern chemistry.
The most notable of Berzelius's contributions to chemistry was his development of a rational system of atomic symbols. Around 1810 Berzelius was working to confirm John Dalton's atomic theory as well as Proust's law showing that separate elements always combined in whole-number proportions. At the same time, he was also compiling the new Swedish Pharmacopoeia. While working on these three projects, Berzelius came to the conclusion that the existing system of denoting elements and compounds was a hindrance. In establishing his own atomic symbols, he stated that "it is easier to write an abbreviated word than to draw a figure which has little analogy with words" (Jaffe 108). Instead of using obscure symbols like circles with arrows extending from their sides, or collections of dots arranged in a specific pattern, Berzelius opted to use the first letter of the Latin name for each element as its symbol.
Berzelius decided that the symbol would be the first two letters of the name.Even though his atomic symbols were introduced in 1814, it was quite a few years before Berzelius's symbols were adopted by the chemistry community. But once accepted, they became the new international language of chemistry.
Which row is carbon in the periodic table?
Look up "the photographic table of elements" on your favorite search engine but...its in the 2nd row.
Did people oppose john Dalton's ideas?
Yes, some people initially opposed John Dalton's ideas, particularly those related to the concept of atoms and the atomic theory. Some critics argued that his theories lacked sufficient evidence and were too abstract to be proven at the time. However, over time, Dalton's ideas gained acceptance and are now fundamental to modern chemistry.
How did Henry GJ Mosely's work contribute to the modern periodic table?
Mendeleev had spent a lot of time and energy arguing that tellurium must have a lower atomic weight than iodine, so that tellurium could fit in with selenium and sulfur, and iodine with bromine and chlorine. But the best work available consistently showed that tellurium had an atomic weight about 1% higher than iodine. With Moseley's work it became clear that although tellurium had a higher atomic weight than iodine, it had a lower atomic number. Similarly he had always had tables that assigned the same atomic weight to cobalt and nickel, while the experimental work showed that nickel had an atomic weight about 0.2% lower than cobalt, but an atomic number that was one greater. And the recently discovered noble gas argon had an atomic weight 2% greater than that of the next element, potassium, but an atomic number that was one less. These three exceptions to Mendeleev's periodic law, led to the modern form of the same law: if the elements are arranged in the order of their atomic NUMBER, then their properties repeat in a periodic fashion.
Which table has different elements arranged by common properties in rows and columns?
The periodic table of elements is the table that arranges different elements based on their common properties in rows and columns. It helps to organize and classify elements by their atomic number, electron configuration, and chemical properties.
Why are less reactive elements found first?
These elements are the most reactive because of the number of electrons floating around them. To put it simply, small numbers of electrons want to join with other electrons, so when a layer of few electrons can join with an almost full layer of electrons to make a full layer, it does, and sometimes violently.
