Periodic Table

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The atoms of the elements in Group 13 (IIIA), the boron group, have three valence electrons, all of which are unpaired. The atoms of the elements in Group 15 (VA), the nitrogen group, have five valence electrons, three of which are unpaired.

A group of soldiers is known as a platoon when it consists of 15-30 soldiers, a company when it consists of 80-250 soldiers, and a battalion when it consists of around 300-1,200 soldiers.

Yes, elements are arranged in the periodic table according to blocks that correspond to the orbitals being filled. For example, the s-block elements fill the s-orbital, the p-block elements fill the p-orbital, the d-block elements fill the d-orbital, and the f-block elements fill the f-orbital. This organization provides a structured way to represent the electron configurations of elements.

Yes, a cation and an anion can be isoelectronic if they have the same number of electrons. For example, in the third period of the periodic table, a sodium cation (Na+) and a fluorine anion (F-) are isoelectronic because they both have 10 electrons.

Su is not an abbreviation used in the periodic table of elements. The symbols on the periodic table represent individual elements and their chemical properties. If you are referring to another symbol or element, please provide more information for clarification.

Scientists in 1750 did not have access to the vast amount of experimental data on elements that Mendeleev had. The understanding of atomic theory, periodic trends, and chemical behavior was not advanced enough at that time to support the development of a table like Mendeleev's. Additionally, the technology and resources needed to collaborate and disseminate scientific information were also lacking in 1750.

carbon is an element ..

but it has a self linking property wherein more than one carbon atoms link together to form a molecule

Mendeleev proposed that there must be missing elements, to which he gave the provisional names Ekaboron, Ekaaluminum and Ekasilicon. Scankium, Gallium and Germanpoop were discovered in 1879, 1875 and 1886, respectively, with properties very close to those predicted by Mendeleev. hey Glen

Alkali metals react faster than alkaline earth metals due to their lower ionization energy and higher reactivity. Alkali metals readily lose their outermost electron to form a +1 cation, making them highly reactive with water and air. Alkaline earth metals, on the other hand, are less reactive as they have higher ionization energies and require more energy to lose their outer electron.

Mendeleev placed arsenic and selenium on the periodic table based on their chemical properties and atomic masses. He arranged elements by increasing atomic mass and grouped them by similar properties. By doing so, he could predict the properties of undiscovered elements and fill in gaps in the periodic table.

Nominally atomic mass, but in practice he knew this wasn't strictly correct and "cheated" a little based on chemical properties in a couple of cases (he thought the measured masses were wrong).

Mendeleev predicted that there would be three additional elements to be discovered based on the gaps in his periodic table at the time. These elements turned out to be later discovered and were named gallium, scandium, and germanium.

There are either 118 or 117 elements in the peiodic table. it depends on the one that you are looking at.

In each element's box on the periodic table, you can typically find its atomic number, chemical symbol, atomic mass, and perhaps its name. It may also include the element's electron configuration and the period and group number to which it belongs.

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Moving down a group, the elements will have the same number if valence electrons. Tis will give them similar properties, such as the Noble Gases, or the extreme reactivity of Group I metals. Moving across a period, elements will begin to resemble each other less and share fewer properties the further apart they are in the row.

The symbol "24mg2" likely refers to the magnesium ion with a +2 charge. Magnesium has 12 electrons in a neutral atom, but since it has a +2 charge, it has lost 2 electrons, giving it 10 electrons in total when it becomes a Mg2+ ion.

Atomic symbols are used to represent elements, a negative (-) and a psoitive (+) represent electrons and protons, respectively. Chemicals or other compounds are often written as a combination of atomic symbols with subscripts to indicate the presence of multiple atoms.

the smallest atom is hydrogen, the smallest molecule would be the naturally occurring diatomic hydrogen.

Hydrogen is an element that is located in the p-block on the periodic table, but based on its properties, it should be with the s-block elements. This is due to hydrogen's ability to lose an electron to form a positive ion, similar to alkali metals found in the s-block.

Bismuth is sometimes referred to as a "cruel joke" because of its name, which sounds like "bis + myth" and could be interpreted as meaning "not a myth" when it actually is a real element.

Plutonium is dangerous because it is a radioactive element that emits high-energy alpha radiation which can damage cells in the body if ingested, inhaled, or absorbed. It is also toxic, with chemical properties that make it harmful to living organisms even in small amounts. Additionally, plutonium has a long half-life, which means it remains radioactive for a very long time, posing a threat to the environment and human health.

No. The position of an element in the periodic table cannot predict the number of isotopes it has. However, the position of an element in the periodic table can predict other properties like the charge of its ion, the formula of its oxide, the acidic or basic nature of its oxide, etc.

When alkali metals react with water they produce an alkali (basic) solution.

No because they form basic oxides and they neutralise acids