The last element in the periodic table that is not radioactive?
Lead is the last element on the periodic table that isn't radioactive. It is also the heaviest of the non-radioactive elements.
Period sever on the periodic table contains all the radioactive elements. Iron, in period 6, is the last stable element on the table, before the radioactive elements.
Uranium, with atomic number 92, is the last naturally occurring element on the periodic table
Ununoctium is the last element on the periodic table. It's symbol is Uuo. It atomic weight is . Its predicted phase is a solid.
Argon (Ar, element number 18) is the last element in the third period of the periodic table.
i have no clue
On the Periodic Table, a Period is one of the horizontal rows. If an element is last in it's period, then it's on the right hand side of the Periodic Table. There is an inert gas at the end of every Period.
Plutonium (atomic number 94) is the last element in the periodic table that may be found naturally, in trace amounts.
The last element in each period is a noble element. It is non-reactive.
The last element of each row is inert element. It is non-reactive and stable in nature.
element, last of the nobel gasses on the periodic table of elements
Zirconium - Zr
The last member of alkali metals the Francium.
February 9th, 1996 with the discovery of Copernicium.
Those are the noble gases.
The valency is 3+
The first row of the periodic table to have 18 elements is the third row, which ends with krypton, Kr.
The last element for which there are claims of discovery is Uus, element 117. That completes the 118 elements on the periodic table.
The heaviest radioactively stable element in the same column of a wide form periodic table as nitrogen is bismuth.
No, many other elements are radioactive or have radioactive isotopes. Examples of this are carbon 14, which is used in carbon dating, Radon, Krypton, Hydrogen, Iodine, and many others.
Plutonium (atomic number 94), found in extremely traces.
well, it depends on how many electrons are there in the last orbital P....it can be any element from Aluminum to Argon (look at the periodic table)
Helium is the second element, on the first column last row. Hope this helps
There are many relatively new elements that have been added to the periodic table over the last few decades, like the element Copernicium, a man made element that was discovered by the Gesellschaft fur Schwerionenforschung (GSI) in 1996. And although there have not been any discoveries in the last 14 years, there are quantum physicists that spend there time looking for the next element.
seaborgium, the chemical element of atomic number 106, a very unstable element made by high-energy atomic collisions.
last group of the periodic table
An nonreactive element in the Periodic Table of Elements is an element that has their last energy level (shell) filled with 8 valence electrons. Some examples of nonreactive elements are Helium, Neon, Argon, Krypton, Xenon, and Radon. Group/Family 18 (Noble Gas/Inert Gas Family) are all nonreactive elements.
Atomic no. 103. Located in period 7 d-block. Last element of the actinide series.
Krypton, and any other elements in the last column of the periodic table besides helium.
It depends on how you look at it. The actinides series look like the last because they are always extended out of the bottom, so if we are going by the last in the actinides, then it would be No (Nobelium). However, if you are looking at the one with the highest atomic weight it would be Ununoctium with an atomic mass of 293 mol.g-1. It is number 118 on the periodic table, and does… Read More
Dimitri Mendeleev did the original in 1869. The last naturally occurring element was Francium, and it allows for the addition of elements that were discovered later.
90 of them are naturally occurring on earth. The other 2, technetium and promethium, must be manufactured in reactors or accelerators and are very radioactive. Elements beyond bismuth in the periodic table are all radioactive. This leaves a total of 81 natural non radioactive elements. Element 92, the last, is the only one to have a naturally occurring fissile isotope, Uranium-235, that can be used to power reactors or build fission bombs. That probably wasn't… Read More
There are many elements that are synthetic, and all of them (so far!) are very radioactive. Uranium (element 92) is the last element on the periodic table that seems to exist in nature. All of the elements past Uranium (elements 93 to 118) do not exist in nature, but are produced in nuclear reactors (as with, for example, Plutonium) or in particle accelerators. The reason these elements do not exist in nature is precisely because… Read More
To find the number of outer electrons in an element, or valence electrons, look on the Periodic Table of Elements. Look at the last number of the electron configuration. An element that has an electron configuration of 2-7 has 7 valence electrons. Link to a periodic table of elements with electron configuration: http://www.chemicalelements.com/show/electronconfig.html
As you move left on the periodic table, the elements get more reactive and as you move down the periodic table. Using that thinking the most reactive elements are the Alkali Earth Metals (column 1) and the most reactive element is Francium. The least reactive are the noble gases in the last column- Helium, Neon, Argon etc..
The element Sodium has three subatomic particles These are Protons, there are 11 in this element Neutrons, there are also 11 Electrons, there are 12 electrons, the last two are Valance Electron That is all! Really hard Pretty simple right? You can look on a dynamic periodic table online, or most science textbooks include a periodic table. -Apples
If you tell me what an f block element is i can help you out. I aced chemistry last semester and ill probably be tutoring it next semester. are u referring to the families in the periodic table?
by knowing the number of electrons in the last shell for metals, for non metals it is the number of electrons it need to attend the octet state
because the valency is no of electrons present in last shell and different element have different electronic configuration.
A good periodic table can tell you a whole lot about elements. Almost every good periodic table will tell you: Atomic Symbol Atomic Number (Number of protons) Mass Physical state at standard conditions Number of valence electrons(especially for main group elements) Number of energy levels The last two can be discerned by the element's location on the table
Dmitri Mendeleev published the first [proper] periodic table in 1869. The last element in period 7 (up to the element with atomic number 118) was confirmed by the International Union of Pure and Applied Chemistry (IUPAC) in December 2015. A total of 146 years. But there may elements in period 8, yet to be synthesised.
The last item in any row of the Periodic Table of Elements is an inert gas.
Elements of the periodic table that are gases are just called gases. There is a whole group of elements in the table that are gases, and they're the inert gases or noble gases. They comprise the elements of group 18 in the table. The inert gases are helium, neon, argon, krypton, xenon and radon. The only other elements that are gases at room temperature are hydrogen, oxygen, nitrogen, and then fluorine and chlorine. Those last… Read More
Krypton is a noble gas. It has 8 electrons in the outermost shell. So it is in the last column of the periodic table.
Existing element is product of nuclear fusion, heavy element exist from over fusion and thus create high atomic mass substance. To answer what is the element that is form last in nuclear fusion in star is the same as asking what is the heaviest element occur or found in nature. Base on what is in periodic table. The heaviest element found naturally is around Uranium - Plutonium thus it could be considered the last product… Read More
Yes. The periodic table has not been the same over the last 75 years, as many more elements have been discovered since then. My grandfather has a mouse mat with a periodic table from 20 years ago, and it is now out of date.
U235 is the last entry on the Periodic Table, of atoms that are ~stable. There are many elements more massive than this, but they are all radioactively unstable. Some consider there may be "an island of Stability" further up the atomic number chart, but we don't know yet. As to a specific heavier element, Americium 95 is one that has found application in ionization smoke detectors.
There are no 'rows' on the Periodic Table of the Elements. I assume you are talking about Group-18 of the table. Group-18 of the Periodic Table of the Elements are the noble gases. These elements have a full valence shell (8 electrons).
Noble gases are in the last column of the periodic table. Atoms of noble gases have 8 electrons in their outer shell, making them stable. The only reason an element reacts with another element is to become stable.
suggested that element 94, being the next element in the series, be named for what was then considered the next planet, Pluto.[note 2] Seaborg originally considered the name "plutium", but later thought that it did not sound as good as "plutonium." He chose the letters "Pu" as a joke, which passed without notice into the periodic table.[note 3] Alternate names considered by Seaborg and others were "ultimium" or "extremium" because of the now-discredited belief that… Read More