Periodic Table Homework

Periodic Table Homework-8
For example, elements to the bottom and far left of the table are the most metallic, and elements on the top right are the least metallic. The Periodic Table was invented and arranged by the Russian chemist Dmitry Ivanovich Mendeleyev (1834-1907).In his honor, element 101 was named after him, mendelevium.Often this is the first letter or two of the element’s name, but it can come from a Latin name. One element that Mendeleyev left a gap for in his periodic table was gallium (element 31).

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The periodic table of the chemical elements is a list of known chemical elements.

In the table, the elements are placed in the order of their atomic numbers starting with the lowest number of one, hydrogen.

The elements are arranged in order of their atomic number.

The atomic number is the number of protons each atom has in its nucleus.

There are 18 groups (columns) in the periodic table.

Group 1 (also known as the alkali metals) is the column on the far left of the table.For example, group 18 is known as the noble gases because they are all gases and they do not combine with other atoms.There are two systems of group numbers; one using Arabic numerals (1,2,3) and the other using Roman numerals (I, II, III).The atomic number of an element is the same as the number of protons in that particular nucleus of an atom.In the periodic table the elements are arranged into periods and groups. Elements in a period have consecutive atomic numbers.You can tell a lot about an element just by knowing which group it is in.As you move down one element in a group, there is a large jump in the number of protons and neutrons in the nucleus, and a new shell of electrons is added.The periodic table has been used by chemists to observe patterns and relationships between elements.There are 3 main groups in in the Periodic Table; metals, metalloids, and nonmetals. There are also many other patterns and relationships.By arranging the elements in this way, those with similar properties (characteristics) are grouped together.As with any grid, the periodic table has rows running left to right, and columns running up and down.


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