Chemistry, 12.05.2021 14:00 yclark98563p5z2gt
Puzzle #1 - Periodic Table Escape Room
About 70 elements had been discovered by the mid-1800s, but until the work of the Russian chemist Dmitri
Mendeleev, no one had found a way to relate the elements in a systematic, logical way. Mendeleev listed the
elements in columns in order of increasing atomic mass. He then arranged the columns so that the elements
with the most similar properties were side to side. He thus constructed the first periodic table, an
arrangement
of the elements according to similarities in their properties. Mendeleev left blank spaces in the table because
thepe were no known elements with the appropriate properties and masses.
Mendeleev and others were able to predict the physical and chemical properties of the missing elements.
Eventually these elements were discovered and were found to have properties similar to those predicted.
In 1913, Henry Moseley, a British physicist, determined the atomic number of the elements. Moseley
arrange the elements in a table by order of atomic number Instead of atornic mass. That is the way the periodic
table is arranged today
Figure out which elements are located at the ABCDE locations on the perlodic table.
Use those elements to crack the code.
Answers: 1
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If a reactant was removed, did the new equilibrium system shift to make more reactants or more products?
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How does a hydroelectric power plant converts energy into energy.
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Chemistry, 22.06.2019 07:30
The table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.
Answers: 3
Puzzle #1 - Periodic Table Escape Room
About 70 elements had been discovered by the mid-1800s, but...
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