Physics Of The Periodic Table

For the lesson observed the objectives was to explain the trends of the periodic table based on the elements’ valence electrons and atomic numbers. Additionally, students were responsible for applying their previous knowledge in calculating subatomic particles to review the Bohr Models and discus the relationship among families in the periodic table. Students will use the information from today’s lesson to make future judgments on reactivity and bonding created during chemical reactions in the next unit. Lastly, students were to connect the information on elemental properties to previous experiences with their health, commercial products, and everyday life.

The elements were organized by Dimitri Mendeleév. He organized them by properties (columns), groups (horizontal), and atomic number (the number of protons and electrons). This became known as the Periodic Table. And currently there are 118 elements. He also found gaps in which elements that were yet to be discovered were to go, three of these unknown elements were found and identified in Mendeleév's lifetime. The elements today are used in everything and 75% of the 118 elements are metal.

John Dalton wrote the modern atomic theory, a fundamental component of that is, the mole ratios of elements in a compound will be small whole numbers.

-Dmitri Mendeleev- first periodic table, organized 63 known elements according to properties, organized into rows and columns and wrote name, mass, and chemical properties on each

The second main contributor toward the atomic structure was John Dalton. John Dalton was the one who brought the atomic theory talk back into play after 2000 years from Democritus. Dalton become fond of the atomic structure following his love from meteorology. He claimed that the forces of repulsion that caused pressure only were between the same atoms and the atoms inside a mixture had different weights and complexity. He then decided to calculate the atomic weights by determining the percentages of each composition in a compound. This allowed him to be able to

In this lab, students compared the periodic trends of the elements in comparison to the atomic number. A periodic trend is the tendency of certain properties of the elements to increase or decrease as one progresses along a row or column of the periodic table. The periodic table is arranged in such a way that these trends are easy to compare, which is the purpose of this lab. One trend, for example, is between the electronegativity and the atomic number on an element, another being the density. When comparing the trends, notice that electronegativity decreases when going down the groups, or columns, of the period table, whereas the density increases.

The periodic table is a table that categorises and displays all of the chemical elements. It is made up of groups, periods and blocks. A group (also referred to as a family) are the columns of elements, there are 8 groups. The elements in each family have similar but not identical properties and they all have the same number of outer electrons. E.g. lithium (Li), sodium (Na), potassium (K) are all soft, white, shiny metals because they are all members of group 1. A period is each horizontal row of elements, there are 7 periods. In a period, the elements are not alike in properties, the first element in a period is always an extremely active solid, and the last element in a period is always an inactive gas. Properties change greatly across a given row. Each new period represents the next shell which electrons fill. A block is a region of the periodic, there are 4 blocks: S, D, P and F.

Filled with shiny, colorful pictures of elements in their many applications, the book was my first in-depth introduction to chemistry. Two pages were dedicated to each element and explained the most common uses. I started to spend time pondering what was in some of the objects around me. I viewed objects more in their elemental sense rather than “plate material” or “cardboard material”. Since then, I’ve only tried to expand my knowledge of the chemical makeup of my world.

The History of the Periodic Table of elements is vast, and filled with interesting facts that not many average people would know about, these four scientists have had all contributed to the table in some way, and lead it to its current state, here is what they have

Honor means to hold with high respect or esteem. My view of honor is to give respect to those who deserve it. Dmitri Mendeleev, the creator of the first periodic table, is one of those who deserve the respect honor has to offer. Dmitri Mendeleev was born February 8, 1834. When he was young, his father went blind and couldn’t work.

The Periodic Table a) The periodic table is a list of all the elements. As well one can find some information about the element ie the atomic number, relative atomic mass and the symbol of the element and sometimes the name of the element. b) The elements are not randomly positioned in the periodic table, they are positioned according to their proton number (atomic number) starting from the element having the least number of protons and ending with the element having the most (from left to right). They are also arranged according to their physical properties.

Periodic Table and Periodic Law Experiment Date: March 16, 2017 20170004 강동현 Co-worker: 박정언 Introduction In 1869, Dmitri Mendeleev and Lother Meyer separately made the periodic table, which showed that the properties of chemicals recur periodically. However, both periodic tables sorted the elements in order of increasing atomic mass.

Who was Demetri Mendeleev and what is his contribution? 14. What is the periodic table? 15. What are groups/families?

Throughout history the periodic table of elements has been influenced and amended by multiple scientists. These scientists include Johann Dobereiner, A.E Beguyer de Chancourtois, John Newlands, and Glenn Seaborg. As well as Dmitri Ivanovich Mendeleev and Lothar Meyer the creators of the periodic table. There are many ways that the periodic table of elements was set out. For example the table can be organized using patterns between atomic numbers, electronegativity, ionization energy, structure (gas or solid) valence electrons and electron configuration (shells) as seen in the modern day periodic table.

Antoine Lavoisier created a list of substances that he considered to be elements. He separated his list of 33 elements into metals and non-metals. Some items on the list were classified as compounds because they could not be determined to be otherwise, because of the lack of technology and equipment available at the time.