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they aren't, they're in numerical order

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Q: Why are the elements at the bottom of the series discovered before the elements on the top?
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What are the two rows at the bottom of the periodic table there?

The name of bottom two rows of the periodic table is lanthinedes and actinides.


What elements is radioactive and synthetic barrium cesium currium and xenon?

Curium {Note correct spelling} is only element in the list given that is radioactive and synthetic.^ not correct answer and not even spelled right the correct answer is "lawrencium"The rare earth elements are located at the bottom of the periodic table and are comprised of the lanthanoid series and the actinoid series.The actinoid series is the second row of rare earth elements. All of these elements are radioactive, and all of these elements (except actinium, thorium, protactinium, and uranium) are synthetic.


What is the name of the elements with atomic numbers 90 through 103?

The elements are called Actinides. They are placed at the bottom of periodic table. These elements have different properties.These elements are in the f group of the periodic table. Elements from Ac-Lr belong to this group. These are called Actinides.


Elements across a series have same number of?

Elements across a series have the same number of atomic energy levels. An elemental series is better known as a period.


What are the radio active rare-earth metals located at the bottom of periodic table?

actinide: 15 metallic chemical elements with atomic numbers from 89 to 103 Actinium, Thorium, Protactinium, Uranium, Neptunium, Plutonium, Americium, Curium, Berkelium, Californium, Einsteinium, Fermium, Mendelevium, Nobelium, Lawrencium

Related questions

The two rows of elements placed at the bottom of the periodic table represent what elements?

they are the lanthanide and actinide series of rare earths


What is the trend in atomic size in the series of Group IIA elements Be through Ra?

Increases from top to bottom.


Why where the lanthanide and actinide elements droped out of order on the periodic tabel?

The vertical columns of the periodic table are arranged to contain elements that have similar chemical and physical properties.The two rows at the bottom (called the Lanthanide and Actinide series) are elements that would all fit into group IIIB, in periods (horizontal rows) 6 and 7. since there is only one spot on the chart for all the elements in each series, they are listed separately at the bottom of the table.


What are the two rows at the bottom of the periodic table there?

The name of bottom two rows of the periodic table is lanthinedes and actinides.


What is the history of arithmetic series?

who discovered in arithmetic series


Which block on the periodic table contains the actinide series of elements?

The actinide elements are in a row at the bottom of most tables, this entire row being an extension of column 3 of the seventh period.


Is actinides a rare earth series?

Actinoids is series of chemical elements; lanthanoids is an other different series.


How many elements are there in the actinoid series?

14 elements.


What elements do no react with other elements?

Elements that are extremely unreactive include: Platinum (Pt), Gold (Au), Helium (He), Argon (Ar), Xenon (Xe), Krypton (Kr). These are unreactive because: Platinum and Gold are the bottom two elements in the metals Reactivity series. The rest are inert gases which are all unreactive.


What is a series of elements?

dgaf


The lanthanide series of elements is composed of?

elements 57 - 70.


What elements is radioactive and synthetic barrium cesium currium and xenon?

Curium {Note correct spelling} is only element in the list given that is radioactive and synthetic.^ not correct answer and not even spelled right the correct answer is "lawrencium"The rare earth elements are located at the bottom of the periodic table and are comprised of the lanthanoid series and the actinoid series.The actinoid series is the second row of rare earth elements. All of these elements are radioactive, and all of these elements (except actinium, thorium, protactinium, and uranium) are synthetic.