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Atomic Mass increases in size as the atomic number increases. For example, hydrogen weighs about 1.01 grams per mole and it has periodic #1. Helium is atomic #2 and it has an atomic mass of 4.00 g/mol. This trend continues all the way to the last known pure element.

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What periodic trends did did Mendeleev organize his periodic table by?

Atomic Mass Octaves and Triads


What trends were seen in Mendeleev's periodic table?

he arranged his Periodic Table by each elements Atomic Mass


How were the elements in the periodic table arranged?

By Atomic Mass


What periodic trends did Mendeleev organize his periodic table by?

Mendeleev organized his periodic table by atomic mass and similar chemical properties of elements to recognize patterns and trends. He arranged the elements in horizontal rows and vertical columns based on these properties, allowing him to predict the properties of undiscovered elements.


Why is the periodic table useful for studying the properties of different elements?

well, the periodic table is very useful because you have the atomic number, atomic mass, and even the trends across a period or down a group.


What trends were first used to classify the elements?

The first trends used to classify elements were atomic mass and chemical properties. The periodic table was originally arranged based on increasing atomic mass, where elements with similar chemical properties were grouped together. This led to the discovery of periodic patterns, eventually resulting in the modern periodic table organized by atomic number.


What was the periodic table first arranged by. How has this changed?

In 1869 Russian teacher and scientist Dmitri Mendeleev, presented a periodic table of the elements based on atomic weights. The current periodic table is arranged by the atomic numbers of the elements.


What trends do you notice about the atomic number and atomic mass as you move left to right across the periodic table?

The atomic number increases from left to right. The atomic number also increases.However, there are few exceptions for atomic mass.


In what order did Mendeleev A range of the elements in the periodic table?

Mendeleev arranged the elements in the periodic table primarily by increasing atomic mass. He also grouped elements with similar chemical properties into columns, which allowed him to identify periodic trends. This arrangement helped Mendeleev predict the existence and properties of undiscovered elements. His periodic table laid the groundwork for the modern periodic table, which is now organized by atomic number instead of atomic mass.


How are atomic mass on the periodic table calculated?

Atomic mass is determined by mass spectrometry.


What characteristic was used to organize the first periodic table?

Mendeleev arranged the periodic table according to increasing atomic mass. This method has been used since he first developed it in the 1800s.


How did chemists organize the elements that were known?

Chemists organized the elements by properties, specifically by atomic mass, to create the periodic table. This organization allowed them to identify patterns and trends among elements based on their chemical behavior. The periodic table was further refined over time as new elements were discovered and their properties were better understood.