Praseodymium
The eighty ninth element in the periodic table is Actinium, with the symbol Ac and atomic number 89. It is a radioactive element that is part of the actinide series.
The sixty-ninth element in the periodic table is thulium (Tm). It is a rare earth metal with atomic number 69 and is named after the ancient city of Thule.
There is no element with the name "fulcrum" on the periodic table. Elements on the periodic table are represented by their atomic number and chemical symbol. You may be thinking of an element that is near atomic number nine, which is fluorine (symbol F).
Manganese is not a rare earth element. The rare earths range from Lanthanum (atomic number 57) to Hafnium (70) and Actinium (89) to Rutherfordium (102). Manganese is atomic number 25. Looking at the periodic table, you will see two rows at the bottom named Lanthanoids and Actinoids - those are the rare earths.
Shoemaker-Levy 9 was named after the team of scientists who discovered it: Eugene Shoemaker, Carolyn Shoemaker, and David Levy. The "9" refers to the fact that it was the ninth periodic comet discovered by the team.
The 29th element is copper.
I think 49th is Indium
The eighty ninth element in the periodic table is Actinium, with the symbol Ac and atomic number 89. It is a radioactive element that is part of the actinide series.
The sixty-ninth element in the periodic table is thulium (Tm). It is a rare earth metal with atomic number 69 and is named after the ancient city of Thule.
The ninth element on the periodic table of elements is fluorine (F). It is a highly reactive, pale yellow gas at room temperature. Fluorine is commonly used in toothpaste and water fluoridation to promote dental health.
There is no element with the name "fulcrum" on the periodic table. Elements on the periodic table are represented by their atomic number and chemical symbol. You may be thinking of an element that is near atomic number nine, which is fluorine (symbol F).
The 109th element in the periodic table is Meitnerium (Mt). It is a synthetic element and is radioactive, with a very short half-life. It was first synthesized in 1982 by a team of German researchers.
Fifty-Ninth Army - Japan - was created in 1945.
Fifty-Ninth Army - Japan - ended in 1945.
The ninth term in a series is called the "ninth element" or the "ninth member" of the series.
It was recognized by the inventor of the Periodic table that these empty spaces are for elements/isotopes that would be discovered someday. Dmitri Mendeleev is generally credited with the publication, in 1869, of the first widely recognized periodic table. He developed his table to illustrate periodic trends in the properties of the then-known elements. Mendeleev also predicted some properties of then-unknown elements that would be expected to fill gaps in this table.
Manganese is not a rare earth element. The rare earths range from Lanthanum (atomic number 57) to Hafnium (70) and Actinium (89) to Rutherfordium (102). Manganese is atomic number 25. Looking at the periodic table, you will see two rows at the bottom named Lanthanoids and Actinoids - those are the rare earths.