Monday, June 21, 2010

Questions: (Electro negativity)

Plot a graph represents the electro negativity and atomic number values of:
1.group 1A
2.Fluorine, chlorine, bromine, and iodine
3.The elements with atomic numbers 11 through 17


Electro negativity: is the tendency of an atom to attract electrons of the chemical bond to itself.
What happens if two atoms of equal electronegativity bond together?

Saturday, June 19, 2010

Electron Affinity

Ionization energy is the energy needed to remove one or more electrons from a neutral atom to form a positively charged ion.

Monday, June 7, 2010

Ionization potential Energy

Ionization potential Energy:
It is the energy needed to remove one or more electrons from a neutral atom to form a positively charged ion.
A multi-electron atom would have many ionization energies
So by definition:

Sunday, June 6, 2010

Trends in atomic radius in the Periodic Table

Trends in atomic radius in Periodic table:

Wednesday, June 2, 2010

Sound - Multiple Choice Test

Question 1
Question: When a wave travels through a medium ______.
1. particles are transferred from one place to another
2. energy is transferred in a periodic manner
3. energy is transferred at a constant speed
4. none of the above statements is applicable
Answer: 3

Tuesday, June 1, 2010

Periodic Properties of the Elements (ATOMIC AND IONIC RADIUS)

Measures of atomic radius: Unlike a ball, an atom doesn't have a fixed radius.
Why? Because it is impossible to determine exactly the location of an electron around the nucleus, so atomic radius can't be measured

Man infects himself with computer virus

University of Reading researcher Mark Gasson has become the first human known to be infected by a computer virus.

Saturday, May 29, 2010

Principles of distributing electrons

Principles of distributing electrons:
Auf-beau principle: electrons occupy the sublevels of lower energy first then of higher one
This diagram predicts the following order of increasing energy for atomic orbitals

Aerogel materials AND (Aerogel Capture Medium)

Silica Aerogels:
With the primary mission of Stardust being to capture dust particles from Wild 2, the Aerogel capture material is one of the most important parts of the craft. Travelling at up to 12.8km/s, the particles possess huge kinetic energy. The aerogel material must strip this energy from the particles without allowing them to alter their composition by being heated or pulverized.

Friday, May 28, 2010

Quantum Numbers

Quantum Numbers: They define:
The volume of space (orbital) where there is maximum probability of finding the electrons.
The energy of each orbital
The shape of each orbital
The direction of each orbital

Modern atomic theory

Modern atomic theory:
Based on:
(Wave-Particle Dualism) the dual nature of the electron
Heisenberg Uncertainty Principle

The dual nature of the electron

Wave-Particle Duality/The Two-Slit Experiment/Electrons:
According to classical physics, electrons should behave like particles - the travel in straight lines and do not curve in flight unless acted on by an external agent, like a magnetic field. In this model, if we fire a beam of electrons through a double slit onto a detector, we should get two bands of "hits", much as you would get if you fired a machine gun at the side of a house with two windows - you would get two areas of bullet-marked wall inside, and the rest would be intact.

Wednesday, May 26, 2010

Future Designer laptop - ROLLTOP //Diploma Thesis//

The device of the flexible display allows a new concept in notebook design growing out of the traditional bookformed laptop into unfurling and convolving portable computer.
By virtue of the OLED-Display technology and a multi touch screen the utility of a laptop computer with:
Its weight of a mini-notebook
Screen size of 13 inch easily transforms into the graphics tablet, which with its 17-inch flat screen
Can be also used as a primary monitor.
On top of everything else all computer utilities from power supply through the holding belt to an interactive pen are integrated in Rolltop. 

Tuesday, May 25, 2010

Drive your Carrrrrrrrrrrr with iPhone, Power Wheels, Laptop

Before u see the video:
The goal of this project is to be able to remotely control an automobile. This involves building:
An automobile control system (ACS)
A remote system that sends commands to the ACS. 

How to Detect period number, group number, block and type of any element

How to Detect period number, group number, block and type of any element only by its Atomic Number:

Groups of Periodic table

Blocks of Periodic Table

Monday, May 24, 2010

Periodic Table

Long form periodic table: Based on:
1) Energy sub levels (s, p, d and f)
2) Auf Beau principle

Saturday, May 22, 2010

Bohr's planetary model

Bohr's planetary model:
1. Developed Rutherford's atomic model
2. Did not consider the properties of electron in classical mechanics theory of Newton as Maxwell had done (by assumption of the continuous radiation of electron) must end up the destruction of the atomic system