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A history of the periodic table is at http://www.wou.edu/las/physci/ch412/perhist.htm A time line presentation of the development of the periodic table is at http://www.ausetute.com.au/pthistor.html Perhaps not the most fascinating, but one of the more available and accessible hard copy presentations of the history of the classification of the elements, is Isaac Asimov's, The Search for the Elements. (Basic Books, 1962; Fawcett Premier paperback reprint, 1966)
Early chemists classified elements based on their properties, such as physical appearance, reactivity, and relative Atomic Mass. They also arranged elements by similar properties into groups and periods, which eventually led to the development of the Periodic Table by Dmitri Mendeleev in 1869.
Generally the development of the Periodic Table of Elements is broken into 3 segments.
1. Döbereiner- classified based off of properties
2. Mendeleev- classified based off atomic mass
3. Mosley- classified based off atomic number
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Which element is a liquid at room temperature?
There are two elements which are liquid at room temperature and they are Mercury (Hg) and Bromine (Br). Copernicium (Cn) might be liquid at room temperature but chemists are not sure about it.
Explain how chemists can state with certainty that no one will discover an element between sulfur and chlorine?
Chemists can state this with certainty because the periodic table follows a specific pattern in terms of atomic number and electron configuration. All elements have been discovered up to atomic number 118, and there are no gaps between sulfur (atomic number 16) and chlorine (atomic number 17) in the periodic table, indicating that no elements are missing between them. This knowledge of the periodic table's structure allows chemists to confidently assert that no new element will be found in this region.
How has the work of chemists affected the environment?
The work of chemists has both positive and negative impacts on the environment. Chemists have developed technologies for water purification, waste treatment, and renewable energy sources that have positively impacted the environment. On the other hand, chemicals produced by chemists can also harm the environment through pollution and the release of harmful substances into ecosystems. It is essential for chemists to continue developing sustainable practices and technologies to minimize harmful impacts and protect the environment.
How did lithium get its symbol?
I don't know for sure. I do know that Lithium's symbol (Li) came from one of two chemists: either John Dalton, who invented the system of using symbols to describe elements, or J. A. Arfvedson, who discovered and named the element. Both chemists lived at about the same time.
What are two elements that made up most of the early atmosphere?
Most of the early atmosphere was composed of hydrogen and helium. These elements were prevalent during the formation of the Earth, but later escaped into space due to the planet's relatively low gravity.
How do chemists use the periodic table law to classify elements?
Chemists use the periodic table to classify elements based on their chemical properties and behaviors. Elements are arranged in the table according to their atomic number and electron configuration, which helps determine similarities and patterns in their reactivity and bonding characteristics. This classification system helps chemists predict how elements will interact in chemical reactions.
How did chemists change Mendeleev's periodic table in early 1900s?
They used atomic number instead of Atomic Mass to organize the elements.
What are the characteristic of the elements was used in early attempts to classify the elements according to their chemical similarities?
Early attempts to classify elements based on their chemical similarities focused on observable characteristics such as appearance, reactivity, and common chemical compounds they formed. Elements were also categorized based on their physical properties such as melting point, boiling point, and density. These early classification systems laid the foundation for the development of the modern periodic table.
Why is the periodic table so valuablee for chemists?
Periodic table group elements with similar properties together. It makes study of elements easier for chemists.
Why chemists need to pure mixtures?
to get the original elements of it
How do chemists write water using elements?
H2o
A table of elements that organizes the elements by atomic number and properties?
Chemists call this the periodic table of elements.
Do scientists have to know all the chemical elements in the periodic table?
No. Firstly not all scientists are chemists. Secondly, not all chemists are working on problems that involve many of the elements. In fact only a small minority of working chemists could name the 15 lanthanide or rare earth elements. Thirdly, all chemists work with computer terminals or reference books nearby where they can easily look up rare or unfamiliar elements.
Why do you need a classify elements?
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What type of scientists made the periodic table?
The periodic table was created by chemists, specifically Dmitri Mendeleev in 1869. Mendeleev organized the elements based on their properties and atomic weights to create a system that displayed the periodic trends of elements.
What kind of scientists studies elements atoms and molecules?
Chemists.
How do chemists organize information about elements?
By grouping the elements on the Periodic Table.
