Atomic clock

CHEMISTRY 17 1ST LONG EXAM REVIEWER I. ELECTRONIC STRUCTURE OF ATOMS -arrangement of atoms’ electrons -the number of electrons in an atom -distribution of electrons around the nucleus and their energies • ATOMS *Billiard Ball Model (JOHN DALTON) *Plum Pudding Model (JOSEPH J. THOMPSON) *RUTHERFORD’s Model of Atom -atoms are tiny, hard, indivisible spheres -electrons (negative charge) occupy the atom - Atom is mostly empty space with a dense nucleus • PROBLEMS with Rutherford’s Model

Name: ______________________________________ Date: ________________________ Student Exploration: Electron Configuration Vocabulary: atomic number, atomic radius, Aufbau principle, chemical family, diagonal rule, electron configuration, Hund’s rule, orbital, Pauli exclusion principle, period, shell, spin, subshell Prior Knowledge Questions (Do these BEFORE using the Gizmo.) 1. Elvis Perkins, a rather shy fellow, is getting on the bus shown at right. Which seat do you think he will probably

influenced the modern world as one perceives it in the present day. The atomic theory has much responsibility for the relation of Greek thought and modern beliefs. Democritus was one of the fir4st Greek philosophers to explain the theory of the atom. He said that it was indivisible. Furthermore, he explained that each element is made of particles, and that change occurs by the transfer of the atoms. In comparison to the modern day atomic theory, Democritus had the correct notion as to the significance

every million years. Manganese is used for many things from steel to spacecraft to batteries. It is also used for purifying water and forms very brightly coloured compounds used for glazing pottery and glass. Manganese Facts: Chemical Symbol Mn Atomic Number (number of protons found in the nucleus of an atom) 25 Mass Number

The purpose of this essay to answer the question “Can we touch anything?” To do this, I have studied the research of other physicists on subjects such as the Pauli Exclusion Principle and electron repulsion. Topics like these are explored throughout the essay to help fully understand this particular concept. Through my research, I came to the conclusion that it is not actually possible to touch anything. This, of course, can lead to many questions, some of which are answered in the discussion section

their atomic number and similarities between chemical properties. The Periodic table holds 118 elements which can be broken down into smaller classifications, groups (vertical), periods (horizontal) and blocks (adjacent). In this paper, we will zoom in one unbelievable element Osmium, which is usually lost in the mix. Osmium was discovered in 1803 by Smithson Tennant. This element was found when Tennant used platinum to dilute aqua regia. He noticed

Lithium is the third element on the periodic table and is known as the lightest metal, and is half as dense as water. It is a part of the Alkali metals, meaning it is in the first group on the periodic table. Lithium is normally not found in nature, due to the fact that it has a very unstable nucleus. The name Lithium is derived from the Greek word lithos, which means “stone”. This name was likely given to Lithium due to the fact that it was discovered in the mineral petalite (LiAl(Si2O5)2) by Johann

In this work, we consider two kinds of a spherically symmetric semiconductor quantum dots: (a) type I single quantum dot (SQD) with radius r_1, in which electrons and holes are confined in the same region of space, and (b) type II core/shell quantum dot (CCQD) with the same core radius, r_1, coated with shell thickness t=r_2-r_1, in which the spatial confinement of electrons and holes depends strongly on the geometrical parameters (core radius and shell thickness) and strain effects. Due to the potential

I am going to discuss the modern concept of the atom. I am going to give a brief history of the atomic model including Thomson's atom, Rutherford's atom, Bohr's atom, and Schrödinger's atom. I am going to include a diagram for each of these models. In 1897 physicist, J.J. Thomson, shortly after discovering electrons, proposed his Plum-Pudding model of the atom. He based this model on the two facts that he knew at the time: 1. atoms contain small negatively charged particles called electrons

I am interested in this element because of the name it was given, the uses we have and have had in the past for it, and the fact that the atomic number is 80, which includes two of my favorite numbers. As previously stated, mercury is number 80 on the periodic table of elements. It is a metal, a transition metal to be exact. It has a symbol of “Hg”, an atomic mass of 200.59, and there are 7 known stable isotopes