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Why were general Washington victories at Trenton and Princeton important?
They proved George's strong army and it would help them later,spirtually and for later battles.
Which one of Columbus's beliefs was later proved to be true?
He believed the world was round and yes, the world is round.
How did James maxwell discover that light wave is an electromagnetic wave?
He added an extra mathematical term to Ampere's law and discovered that with what are now called Maxwell's equations there is a free-space solutions in the form of waves. He found that the wave solutions travel at the speed of light, so he guessed that they were light. This was later proved to be correct. The equations also predicted the existence of radio waves and these were discovered 15 years later.
What happend when Pierre Curie tested radium on his skin?
skin turned grayish, hurt, and he thought radium could be used in treating cancer. that was later proved after his death.
What accusation was given by President Bush as a reason for invading Iraq but later proved false?
It was suspected that Sadam Hussein had "weapons of mass destruction" that he was hiding from the UN inspectors.
Did Mendeleev think all the elements had been discovered?
No, Dmitri Mendeleev did not believe that all the elements had been discovered when he created his periodic table in 1869. He left gaps in his table for elements that were yet to be discovered, predicting their properties based on the patterns he observed. Mendeleev's foresight proved accurate when several of these missing elements, such as gallium and germanium, were later identified.
How did Mendeleev predict the existence of unnatural elements?
Mendeleev predicted the existence of unnatural elements by leaving gaps in his periodic table for elements that had not yet been discovered. He used the properties of known elements around these gaps to infer the characteristics of the missing elements, thereby predicting their existence. This approach proved successful when later discoveries confirmed the existence of these predicted elements.
What is the correct chronological order of scientists contributing to the modern periodic table?
Dmitri Mendeleev was the first to develop the modern periodic table in 1869. Later, Henry Moseley rearranged the elements by atomic number, which is the modern arrangement. So, Mendeleev comes before Moseley in terms of their contributions to the modern periodic table.
Who is mendeleev and Meyer?
Dmitri Mendeleev and Julius Lothar Meyer were two chemists who independently developed early versions of the periodic table of elements in the 1860s. Mendeleev is often credited with creating the first widely recognized periodic table, organizing elements by their atomic mass and predicting the properties of undiscovered elements. Meyer also arranged elements based on atomic volume and demonstrated periodic relationships, but Mendeleev's table included predictions that later proved accurate, solidifying his legacy in the field of chemistry. Both contributions were crucial in understanding the organization of elements in chemistry.
Did mendeleev know about protrons?
No, Dmitri Mendeleev did not know about protons. The concept of protons was not discovered until later in the 20th century, after Mendeleev's time. Mendeleev is most famous for creating the periodic table of elements.
What is corpernicus theory?
Contrary to most people of the 14th Century, Copernicus believed that the Earth revolved around the sun. Galileo later proved Copernicus' theory to be correct.
Was Mendeleev correct in his prediction for the melting point of the missing element?
Yes, Mendeleev was generally correct in his predictions for the melting points of missing elements based on his periodic table. He used the trends observed in the properties of known elements to estimate the characteristics of undiscovered ones. For example, he predicted the melting point of gallium, which was later discovered, and it closely matched his estimation. This demonstrated the validity of his periodic law and the predictive power of his periodic table.
What is the MMR scare?
When a man Dr John Wakefield made up false evidence that there was a link between the MMR vaccine and autism. Later, the evidence was found to be proved wrong and it has been definitely certified that there is nothing wrong with the MMR vaccine and is safe to use.
What prediction did Mendeleev make that came true in less than 20 years later?
Mendeleev's prediction that there were elements missing from the periodic table was confirmed when gallium was discovered in 1875 and germanium in 1886, fulfilling the gaps Mendeleev had left in his periodic table.
What was the thing that was blank on Mendeleev's periodic table?
The elements which were not discovered at that time were made blank. Mendeleev named them as eka-aluminium, eka-silicon etc. They were discovered later and were placed in the gaps.
What describes Mendeleev and use of the term Eka aluminum?
Dmitri Mendeleev was a Russian chemist who created the periodic table. The term "Eka aluminum" refers to the element gallium, which he predicted would exist based on gaps in the periodic table and similarities with aluminum. Mendeleev's predictions were accurate and gallium was discovered later.
How did Mendeleev discover the patter that led to the periodic table?
Mendeleev arranged elements in order of atomic mass. He arranged elements in rows and columns that later helped in discovering modern periodic table.
