The history of the periodic table of elements
By: John JS Smith
The modern periodic table of the elements is a chemist's must-have for doing many of the things required by the profession. It helps them predict properties of elements such as chemical reactivity, state of matter, and electron configuration. Though this diagram seems flawless, it hasn't...
Is there any proof that aliens exist?
By: Roberto Chiodetti
Aliens or not aliens? From the moment we humans became self aware, one nagging question bugs us more than anything else: are we the only species to have developed self-awareness or there are others waiting to be discovered in the vast cosmos that surrounds...
By: Jim J Jones
No matter how many times you tear apart a lego toy and rebuild it, the number of blocks you are using stays constant. This obvious, intuitive principle is the foundation for the law of conservation of mass, which dictates that no matter how how many...
A history of space exploration tragedies
By: Roryanne O'Rourke
The tragic deaths of the US astronauts of the Apollo 1 fire caused many to wonder whether space exploration was worth the risk. Astronaut Gus Grissom, one of those that perished in the fire on January 27, 1967, once said, "If we die, we want...
By: Wayne Mcdonagh
Elements and compounds are different in many ways and for many reasons. I shall explore three ways in which they are different. But in order to understand this you must first understand the nature of an atom. For those of you who aren't obsessed with...
Understanding the periodic table of elements
By: Sherry Horton Blake
If you are not familiar with the periodic table of elements, when you first look at it, it may look like an undecipherable page of letters and numbers (actually, even if you are familiar with it, it may look like an undecipherable page of letters...
What information should go on a chemistry lab report
By: Ernest Capraro
Ultimately, the information required on a lab report is whatever your teacher, professor, lab supervisor, or research advisor expects to see, and you should always follow their guidelines. The lab report serves two purposes - it is a thorough record of what you did, and...
Biography: Edwin P. Hubble
By: Sylvia Harrison
Edwin Powell Hubble Edwin Hubble was one of America's most influential astronomers. One of 7 children of John P. Hubble and Virginia Lee James Hubble, he came into the world on November 20, 1889 in Marshfield, Missouri. Edwin's father was an insurance executive and was...
By: John Traveler
Whereas the physical characteristics and properties of an element are determined by the number of protons in the atoms nucleus, the isotope of an element is determined by the number of neutrons in the nucleus of the atom. All elements by default have at least...
How to properly pronounce the planet Uranus
By: Carol H. Morgan
The planet Uranus has some of the most fascinating physiology of the nine planets, with features such as its distinctive rings and bizarre and improbable gaseous constitution. The problem that teachers and parents of children may run into when discussing these qualities, however, is...

 

1 315 316 317 318 319 547
CHOOSE YOUR SCIENCES 360 TOPIC: