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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
Is americium found naturally or made your scientists?
Americium is not found naturally in significant amounts and is typically produced in nuclear reactors or particle accelerators by scientists. It is a synthetic element created through nuclear reactions involving plutonium.
How many period are there in the Modern Periodic Table?
The Periodic Table has 18 groups and 7 periods.
What contains a metal and non-metal chemically combined?
A compound containing a metal and a non-metal chemically combined is called an ionic compound. In ionic compounds, metal atoms lose electrons to form positively charged ions, while non-metal atoms gain electrons to form negatively charged ions, resulting in an attraction between the ions that holds the compound together. Examples include sodium chloride (NaCl) and calcium oxide (CaO).
How do you find the symbol of an element?
You can find the symbol of an element by looking at the Periodic Table, where each element is represented by a unique symbol. These symbols are usually one or two letters long and are used to represent elements in chemical formulas and equations.
PbSO3 is Lead Sulfite, while the 2 at the beginning denotes the amount of that compound there is. For example, there are two Lead Sulfite atoms.
Pb is Lead
SO3 is the polyatomic ion known as sulfite
What is the shortest atomic radius of an element?
Helium usually is listed with the smallest atomic radius when calculated. Hydrogen however has a smaller van der Waals radius
Why the diamond is by far the strongest element?
Diamond is an allotrope of Carbon, the reason for it's strength is pyramid-like structure is that of the strongest structures known to man, this therefore means it can be used for jewellery because the jewell itself cannot be broke or crushed and tipping a workman's tools because it can cut or grind through any metal without breaking. Diamond's structure disables itself to conduct electricity because all it's electrons are delocalised meaning they have no 'spare' electrons to pass electricity through it's structure...
Amethyst is mainly composed of silicon dioxide, or quartz, with trace amounts of iron that give it its purple color. The purple hue can vary, depending on the amount of iron present during its formation.
What was the controversy in naming element 104?
The Joint Institute for Nuclear Research (JINR) at Dubna, Russia, proposed the name: kurchatovium (Ku). However, scientists at Lawrence Berkeley Laboratory claimed to have discovered element 104 first and proposed the name: rutherfordium (Rh). IUPAC ended up accepting the name rutherfordium.
Ionic Bonding
Elements can combine with other elements by ionic bonding, in which one atom gains one or more electrons, forming a negatively charged ion, and the other atom loses one or more electrons, forming a positively charged ion. The oppositely charged ions combine by means of electrostatic attraction to form an ionic compound.
Covalent Bonding
Elements combine to form molecules by means of covalent bonding, in which the atoms of both elements share electrons in a covalent bond.
What two groups are removed from the main body of the periodic table?
Lanthanides and actinides are the two groups that are usually removed from the main body of the periodic table and placed below it to conserve space.
Is it true that elements with atomic numbers greater than 92 can only be found in a science lab?
Yes, elements with atomic numbers greater than 92 are considered transuranium elements and are typically only produced in laboratories through nuclear reactions. These elements are highly unstable and have short half-lives, making them extremely rare in nature.
What is the atomic number of xeon?
The atomic number of xenon is 54. It is a noble gas found in the Earth's atmosphere and is known for its inert properties.
What elements are like ununtrium?
Ununtrium is a synthetic element that belongs to the halogen family in the periodic table. It shares similarities with other halogens such as fluorine, chlorine, bromine, and iodine in terms of chemical properties, being highly reactive and likely to form compounds with other elements.
What is common about most of the names of the polyatomic ions?
If it contains a number in its formula (such as in peroxide, O2-) it is polyatomic as this means there are more than one atom of the same type.
If it contains more than one element, which you would find if there is more than one capital later. (such as in hydroxide, OH-).
If both are true, it is polyatomic (as in permanganate MnO4-).
If it ends in -ite or -ate it is polyatomic (as in sulfate, SO42- and sulfite, SO32-)
If the name of the ion does not contain the name of an element, it is polyatomic (as in cyanide CN- or ammonium NH4+).
How would 0.00930 meters be expressed in scientific notation?
0.00930 meters in scientific notation would be 9.30 x 10^-3 meters.
Which metallic element has an atomic number of 45?
The element with atomic number 45 is Rhodium (Rh). Rhodium is a transition metal in Group 9, Period 5 of the Periodic Table. Rhodium has 45 electrons in 5 electron shells with 1 electron in the outer shell.
Why does boron-11 have 5 protons and 5 neutrons?
Boron-11 is an isotope. The atomic number of Boron is 5 which means it has 5 protons, (if there were more or less protons the element wouldn't be boron). the isotope number (11) is the number of protons plus neutrons. to find out the number of neutrons you would take take the isotope and subtract it by number of protons (11-5) which yields 6. To find the isotope add the number of protons to the number of neutrons.
What is the total number of atoms that make up iodine pentachloride?
Iodine pentachloride (ICl5) is composed of 1 iodine atom and 5 chlorine atoms, totaling 6 atoms overall.
What are benefits of being a member of a formal group?
Some benefits of being a member of a formal group include access to resources, networking opportunities, shared knowledge and expertise, and a sense of belonging and support from like-minded individuals. Formal groups can also provide opportunities for collaboration, professional development, and growth.
How could modern periodic law remove various anomalies of mendeleevs periodic table?
1.) The atomic mass in Mendeleev's periodic table does not increase regularly. therefore, it was impossible to predict the number of elements between two elements.
The Modern periodic table has been made according to the increasing atomic number (Modern Periodic Law states that 'The properties of an element are the periodic function of its atomic number). The atomic number gives us the number of protons in the nucleus of an atom. the atomic number increases by one as we go from one element to the next. thus, this makes it easy to ascertain how many undiscovered elements may be there between two known elements.
2.) Mendeleev's periodic table was made according to increasing atomic masses. we know that of an element have same chemical properties and atomic number, but different atomic masses. So, the concept of isotopes can not be satisfied.
The Modern periodic table is according to increasing atomic numbers. Therefore, the problem of isotopes is easily dealt with.
Which element in group IIA is the best reducing agent?
Barium (Ba) is the best reducing agent in group IIA because it has the most metallic character and the lowest ionization energy. This makes it easier for barium to lose electrons and act as a reducing agent in chemical reactions.
Who created the first periotic table of elements?
The first periodic table of elements was created by Dmitri Mendeleev, a Russian chemist, in 1869. He arranged the elements in order of increasing atomic weight and grouped them based on similar properties, leading to the development of the modern periodic table.
