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The old Periodic Table was arranged according to the mass number (the weight of the atom overall, including neutrons, protons and electrons), whereas the modern periodic table is arranged according to the atomic number (which only includes the number of protons present in the atom, and increases by one as you move from left to right across the table). This makes a difference because some atoms have unequal numbers of protons and neutrons, which can throw off the weight of the atom.
What else can I help you with?
What other numerical value appears in the square for each element on periodic table other than the atomic number?
Almost all "seriously intended" periodic tables also include average Atomic Mass numbers. (Some periodic tables intended for primarily decorative use may not contain any numbers at all.)
Are their any other periodic tables?
yes all sorts of them......such as spiral, mendeleev, kimyaoukulu, and many more
What is the name of the other man who was important in developing the first periodic tables in 1869?
Dmitri Mendeleev and Lothar Meyer
What does the periodic table contain?
The four pieces of information in each box of most periodic tables are the element's name, the element's symbol, the element's average atomic weight and the element's atomic number. Other periodic tables have other information, but standard periodic tables almost always have those four.
Why are periodic tables important in chemistry clasases?
Periodic tables are important in chemistry classes because they provide a systematic way to organize and display the elements based on their atomic number, electron configuration, and chemical properties. This organization helps students understand trends and patterns in the behavior of elements, which is crucial for predicting how different elements will react with each other. Additionally, the periodic table serves as a reference guide for identifying elements and their properties.
How many period are there in the Modern Periodic Table?
The Periodic Table has 18 groups and 7 periods.
What is the file used to store Microsoft Access forms and reports?
They are all in the file along with the tables and other elements, as part of the database.They are all in the file along with the tables and other elements, as part of the database.They are all in the file along with the tables and other elements, as part of the database.They are all in the file along with the tables and other elements, as part of the database.They are all in the file along with the tables and other elements, as part of the database.They are all in the file along with the tables and other elements, as part of the database.They are all in the file along with the tables and other elements, as part of the database.They are all in the file along with the tables and other elements, as part of the database.They are all in the file along with the tables and other elements, as part of the database.They are all in the file along with the tables and other elements, as part of the database.They are all in the file along with the tables and other elements, as part of the database.
The first element on the periodic table is what?
Dimitri Mendeleev is credited with the the creation of the first modern and rational periodic table of chemical elements; but other chemists also had contributions.
What family of elements was originally left out of the periodic table?
The noble gases, column 18 in the most common modern periodic table.
What nonmetals are in the hydrogen family?
None. In modern periodic tables H is included in group 1- this is called the alkali metal family- all the other members of rhe group are metals. It is not usually called the hydrogen family. Hydrogen is included with the alkali metals in group 1 because its ouetr shell contains 1 electron- however hydrogen is different from the other members of the grouo in its chemistry.
Comparision between Intel and sybase?
Both of them are torally differant to each other Intel is a processor while sybase is a database
What are the differences between Mendeleev and modern periodic table?
Mendeleev invented the periodic table in 1869. In those days there were still elements missing, they had no idea of what electrons were or how they related to chemistry, or how the nucleus related to atomic weight.; but they're really the same charts.
