were recorded‚ including the height of foam‚ in a table 7. The process was repeated for the remaining metals Hypothesis: It was predicted that Magnesium would be most reactive metal in the experiment. Background: As the group number decreases‚ reactivity increases. As the period increases‚ the most reactive is towards the bottom. The alkali metals (Group 1 metals) are identified as the most reactive of all present elements on the periodic table. Seeing as potassium and sodium are both found in
Premium Metal Chemical element Periodic table
only smarter but also cheaper‚ it seems entirely possible that they could eventually replace teachers. Computers and technology already serve as teaching aides. Whether it’s teaching children their ABC’s or helping a college freshman memorize the periodic table‚ technology for educational purposes is already available. Someday sooner than we think‚ robots and other technologies will replace teachers. This will solve budget crises because robots do not ask for salaries‚ pensions‚ or benefits. It will
Free Education Teacher Periodic table
November 10‚ 2014 Chemistry Henry Moseley Henry Moseley was a very accomplished British physicist. Henry was born in Weymouth Dorset‚ off the coast of southwestern England. Of his many great accomplishments he is generally known for sorting the periodic table by atomic number. Henry is important because of his work with atoms and the use of x-rays to study them. Moseley was a very bright scientist during the 19th century and his work helps even chemist today. Henry was born into a rather wealthy family
Premium Atomic number Chemical element Periodic table
ZINC Zinc is one of the natural elements on the periodic table. It was discovered in Germany in 1746‚ by Andreas Marggraf. The name is from the German‚ ‘zinc’‚ which may be derived from Persian‚ which means ‘sing’. The element was known to the Romans but they rarely used it. When it was first used it was recognized. Zinc has a specification of metal made from ore or another material a process of distillation by electrolysis. The atomic number for zinc is 30. The mass number is 65.39 mass units
Premium Chemical element Atom Chemistry
location on the periodic table based on the atomic number and type of material‚ and how this specific area determines its atomic “identity” and relation to other elements. This also includes the reactivity of elements based on their electron configurations. This relates directly to what we have studied in Chapter 5 of our textbook. One example from The Disappearing Spoon was about the halogens group of elements. This group is one of the most reactive of the entire periodic table because the outer
Premium Atom Atomic number Electron configuration
orbitals and will not take any more… We will ignore transition metals for now Trends in Electron Affinity • The trend is to increase as you go right across the Periodic Table because there are more protons in the nucleus to attract them… Trends in Electron Affinity • The trend is to decrease as you go down the Periodic Table because the electrons are further from the nucleus. Exceptions in Electron Affinity • Notice how the Alkaline Earth and Nitrogen Group break the trend? Why do
Premium Periodic table
known by the symbol “K”‚ has an atomic number of 19 and an atomic mass of 39.0983. The atomic number of 19 implies that it contains 19 protons‚ 19 electrons‚ and 19 neutrons. It is found in Group 1‚ the alkali metals‚ and the fourth family on the periodic table. Because it is located in group one‚ it is one of the most highly reactive and electropositive metals and is a base. Potassium is a solid‚ silvery white metal at 298 Kelvin‚ and has a melting point of 336.53 Kelvin; the boiling point is 1032 Kelvin
Premium Potassium Chemical element Metal
the pink and blue litmus paper. Also a balanced equation was written to show the reaction between oxides and water. INTRODUCTION Chemical periodicity is defined as the similarities of chemical elements that are close to each other in the periodic table. When elements are arranged in order of increasing atomic number‚ their physical and chemical properties recur periodically. For example‚ magnesium‚ calcium‚ and strontium are all hard‚ very reactive‚ silvery metals while neon‚ argon‚ and krypton
Premium Chemistry Periodic table Chemical element
Electron Configurations and the Periodic Table Practice Problems History of the Atom CW: 1. Why is it not possible for an electron to continue in a set orbit around the nucleus like a planet around the sun? HW: 2. Explain how emission spectra of gasses helped scientists to determine electrons traveled in energy levels. Energy Level Diagram CW: 3. Draw the energy level diagram for Iron. 4. Draw the energy level diagram for Sulfur. 5. Draw the energy level diagram for Argon 6. Draw the
Premium Periodic table Alkaline earth metal Metal
silvery white and classified as metallic‚ which means it resembles a metal or metals. On the periodic table‚ the element calcium is located in group two. Group two is the alkaline earth metals‚ which means calcium is an alkaline earth metal. Also‚ on the periodic table it is located in period four. The block calcium is in is the s-block. The elements in the s-block are located in the first two periodic table groups. The electron shell structure for calcium are 2.8.8.2. For calcium‚ the CAS registry
Premium Atom Chemistry Chemical element