How many covalent bonds are normally formed by C? How does the number of atoms in a 27.5 gram gold ring compare to the number in a copper ring of the same mass? How do you know what element is chemically active on the periodic table? Classify each substance (I have...
How many valence d electrons does Fe2+ have? Is Fe2+ diamagnetic or paramagnetic? Paramagnetism and Diamagnetism:A paramagnetic chemical species is attracted to the magnetic fields. A paramagnetic compound, atom, or ion has one or more unpaired electrons in its orbitals. ...
When the ultraviolet light strikes atom of the phosphors (shown here as white dots), it excites their electrons in just the same way that the mercury atoms were excited. This makes the phosphor atoms unstable, so they give off their excess energy as photons—which, this time, happen to be...
Does light travel as a wave, a ray or a stream of particles? Is it a single color or many colors mixed together? Does it have a frequency like sound? And what are some of the common properties of light, such as absorption, reflection, refraction and diffraction? You might think ...
How many Mars rovers have been sent to Mars? NASA has sent five rovers to Mars: Sojourner, Spirit, Opportunity, Curiosity and Perseverance. What are the 2 rovers on Mars called? The two rovers on Mars are Curiosity and Perseverance. How many rovers are currently on Mars? There are two ro...
Many living specimens must be cut into thin sections before observation. Specimens of rock or semiconductors are too thick to be sectioned and observed by transmitted light, so they are observed by the light reflected from their surfaces. Fluorescence Microscopy Light path of an epifluorescence ...
If one kilometer is equal to 0.6 miles, how many kilometers would you have traveled if you have traveled 42 miles? Answer and Explanation: Learn more about this topic: Arithmetic with Decimal Numbers from Chapter 3/ Lesson 3 54K Depending upon the op...
Mercury is a liquid metal at room temperature, and its properties mean that it tends to form balls. Because of the strong metallic bonding forces between mercury atoms, it has a really high surface tension. This causes the surface of the mercury to be drawn into itself to minimise its surfa...
Where does the light come from? When the power supply is turned on, the gas atoms suddenly find themselves under incredible, electrical force and split into smaller parts. This is called ionization (or ionizing the gas). The broken bits of atoms (positively charged ions and negatively charged...
It is made up of many small particle-like packets that have energy and momentum but no mass. These particles, called light photons, are the most basic units of light. (For more information, see How Light Works.) Atoms release light photons when their electrons become excited. If you've ...