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Directions Answer the following questions to complete the information needed to make a Profile of the Modern Penodic Table Write your answer on a sheet of paper.

1.Name the English chemist who arranged the elements in the modern Penodic Table order of increasing atomic number
2.State the modern Periodic Law which is the basis for this arrangement
3.How many honzontal rows cailed periods and vertical columns called groups make up the Periodic Table? 4.How are these penods and groups labeled
5.Describe the elements that belong to the same group
6.What name is given for elements in groups 1.2.13-18? Groups 3-12? 2 rows of elements at the bottom of the Periodic Table?
7.What does the stair step line separate? 8.What kind of elements are located on the left side of this star step line? On the right side? along the stair step line?
9.Why is Periodic Table an important tool in the study of elements?


Profile of Periodic Table​

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Answer:

1. In 1869, Russian chemist Dmitri Mendeleev created the framework that became the modern periodic table, leaving gaps for elements that were yet to be discovered. While arranging the elements according to their atomic weight, if he found that they did not fit into the group he would rearrange them.

2. The chemical elements are arranged from left to right and top to bottom in order of increasing atomic number, or the number of protons in an atom's nucleus, which generally coincides with increasing atomic mass.

3.In chemistry, a group (also known as a family) is a column of elements in the periodic table of the chemical elements. There are 18 numbered groups in the periodic table; the f-block columns (between groups 3 and 4) are not numbered.

4. Groups and periods are two ways of categorizing elements in the periodic table. Periods are horizontal rows (across) the periodic table, while groups are vertical columns (down) the table. Atomic number increases as you move down a group or across a period.

5. All the members of a family of elements have the same number of valence electrons and similar chemical properties.

6.Group 1&2- Metals

Group 13-18, Nonmetal

Group 3 -12 The Transition Metals

Inner Transition Metals are the two rows at the bottom of the periodic table called the Lanthanide Metals and Actinide Metals

7. The Metalloids

8. the stair step divides the Nonmetal and Metal elements. The right side are nonmetal and on the left side are metal

9. The periodic table has gone through many changes since Dmitri Mendeleev drew up its original design in 1869, yet both the first table and the modern periodic table are important for the same reason: The periodic table organizes elements according to similar properties so you can tell the characteristics of an element just by looking at its location on the table.

Scientists use the periodic table to quickly refer to information about an element, like atomic mass and chemical symbol. The periodic table's arrangement also allows scientists to discern trends in element properties, including electronegativity, ionization energy, and atomic radius.

Another useful feature of the periodic table is that most tables provide all the information you need to balance chemical reactions at a glance. The table tells each element's atomic number and usually its atomic weight. The typical charge of an element is indicated by its group.