examen 24/11/2017 Flashcards
who made the first atomic table, when, and how many elements it contained?
Lavoisier in the 1700s with 33 elements
When was a boost of known elements and why?
In the 1800s thanks to the electrivity and industrial revolution
When was the standard way to organize elements by mass created?
1860
When did John Newlands proposed a new way to organize elements using which law?
1864 using the law of octaves
When did Mendelev published his own version of the periodic table?
1869
When and how did Moseley fixed Mendeleev’s table?
in 1913 by arranging element by atomic number and not mass.
There is a periodic repetition of chemical and physiscal properties of elements when they are arranged by increasing atomic number
Periodic Law
In ___ he invented the chemical language of symbols.
in 1813, Jacob Berzilus
Inventor of the law of triads and when it was made.
Johann Döreiner in 1829
When and who invented the Telluric helix
1862 Alexandre de Chancurtois
Who splitted the periodic table and when?
1945, Glenn Seaborg
-Good conductors.
-High Tensile strength.
-Malleable
-Ductile
-Metallic luster
-Most of them are solid
-High densities
-High melting points
-Crystal structure
These are characteristics of:
metals
-Poor conductors
-Dull appearance
-Brittle
-1/2 of the are gases one liquid and the others solid
-Low densities
-Low melting points
Are characteristics of:
Non-metals.
these are the only Semi-conductors:
Metalloids
The amount of energy released when an electron is added to a neutral atom.
Electron Affinity
