Periodic Table

It is difficult to obtain 100 percent oxygen from fractional distillation because oxygen has a boiling point of -183 degrees Celsius, which is very close to the boiling points of other components in air like nitrogen and argon. Achieving complete separation is challenging due to the small difference in boiling points between oxygen and these other gases.

The element in period 4, group 7 of the periodic table is Manganese (Mn).

6th row (period 6)

12th column (group 12)

Transition elements are found in the middle of the periodic table because they have incomplete d orbitals in their electron configuration. This allows them to exhibit multiple oxidation states and form complex compounds. Transition elements also show characteristic properties such as variable valency and the formation of colorful compounds.

Group II elements (also called alkaline earth metals), have two valence electrons. To fill their outer shell, they therefore become ions with two positive charges, such as magnesium:

Mg -> 2e- + Mg2+

The meeting should be arranged by firstly doing checks on resources needed, venue, whether refreshments are needed, arrange and circulate agenda, invite attendees and information on special needs.

Alkali metals react with ammonia liquid to form metal amides and ammoniated electrons. These ammoniated electrons are responsible for absorbing energy from visible light, leading to a deep blue color in the solution. This phenomenon is known as charge transfer complexes.

The numbers are just a label. Column 1 through column 18. There are a variety of patterns to notice as you move left to right. The most important would be that as you move to the next column you add one more proton. If you're speaking of neutral atoms, you add one electron.

Horizontal rows on the periodic table are called periods. Each period represents the number of energy levels or electron shells that an atom's valence electrons occupy. Moving from left to right across a period, the number of protons and electrons increases.

Family in Group 18 of the periodic table refers to the elements known as the noble gases. These elements have a full outer electron shell, making them stable and non-reactive. The noble gases include helium, neon, argon, krypton, xenon, and radon.

Vertical columns in the periodic table are called groups or families. Elements within the same group have similar chemical properties due to the same number of valence electrons. Each group is labeled with a number and sometimes a letter.

lanthanide contraction, or f-block contraction.

Source:
http://facultyfp.salisbury.edu/dfrieck/htdocs/212/rev/table/size.htm
In the data given for group 13 there is an interesting deviation from the expected trend for atomic radius. At first, we might expect that an atom of Ga would be larger than an atom of Al based on their positions in group. Gallium, however, is considerably smaller than Al due to a phenomenon known as the d-block contraction. As explained above, atoms get smaller as we progress from left to right across a given period, thus in period three Na is larger than Mg, Mg is larger than Al, Al is larger than Si, etc., until we arrive at Ar, the smallest atom in row. The next element, K, is in period four and is, as expected, larger than any period three atom. Again, as we progress to the right atomic radius decreases due to increasing Zeff. It is in period four, however, that we first encounter the transition elements. Atomic radius decreases as we move from Sc to Ti to V, etc., as electrons are added to the d-subshell. By the time we completely fill the d-subshell and reach the p-block elements, the atomic radius has decreased so much that Ga is actually smaller than Al. Because of the d-block contraction, the post transition elements of period four are about the same size as their period three congeners. Similarly, the occurrence of the f-block elements between the period six s- and p-blocks causes the period six p-block elements to be about the same size as their period five congeners. This effect is called the lanthanide contraction, or f-block contraction.

There are currently 118 elements in the periodic table.

2Ni3(PO4)2

Nickel phosphate.

6 nickel atoms

4 phosphorous atoms

16 oxygen atoms

Now, this

PO4 3-

is the polyatomic ion phosphate and is internally covalently bonded, so it could be called a molecule, though it is charged.

there are 2 PO4 3-

There isn't a universally agreed upon answer to this question, as the usefulness of an element can vary depending on context and application. However, some may consider francium to be one of the least useful elements as it is extremely rare, highly radioactive, and has no significant practical applications due to its short half-life and scarcity.

All group 1 elements have a +1 charge because they readily lose their outermost electron to achieve a full outer shell and attain a stable electron configuration.

It is subjective to determine the "best" element as each element serves unique purposes in chemistry and daily life. However, hydrogen is considered fundamental as it is the most abundant element in the universe and plays a crucial role in various chemical reactions.

I'm not sure what you mean by "simble" as it's not a recognized element on the periodic table. If you meant "symbol," it refers to the abbreviation used to represent an element. For example, H is the symbol for hydrogen and O is the symbol for oxygen.

Copernicium is a synthetic element with very limited research on its properties. It is expected to be a poor conductor of electricity like other elements in its group on the periodic table.

- The Group 1A elements are called alkali metals.

- The Group 2A elements are called alkaline earth

metals.

- The nonmetals of Group 7A are called halogens.

- The Group 8A elements are called the Noble Gases

Carbon graphite is commonly used in electrodes for batteries, brushes in electric motors, lubricants, and as a structural material in high-temperature applications due to its excellent thermal and electrical conductivity, as well as its lubricating properties. It is also used in the production of crucibles and molds in the metallurgical industry.

"He" stands for helium in the periodic table of elements. It is a colorless, odorless, and tasteless gas that is the second lightest and second most abundant element in the observable universe. Helium is commonly used in balloons, airships, and cryogenic applications.

well instead of cheating here just go look it up actually do the research dont just expect the answer to be given to you dumbnut you dont deserve the answer if your just going to cheat you losers!

A nonnast table is not a recognized table type or term in databases or computer science. It may be a misspelling or a term used in a specific context that is not widely known.