Periodic Table

Europium, with the chemical symbol Eu, is the chemical element with the atomic number 63.

Mercury. Mercury is a toxic element that can be harmful when inhaled as a vapor. It is commonly stored in containers to prevent accidental exposure.

[Kr] 5s(1)

or, in the longer version


1s(2) 2s(2) 2p(6) 3s(2) 3p(6) 4s(2) 3d(10) 4p(6) 5s(1)


Note: All the numbers in the parentheses are supposed to be in superscript (not sure how to do it) and they represent the number of electrons in the sublevel. The first configuration uses the noble gas Krypton (basically an abbreviated form of electron configuration). Both configurations are according to the Aufbau principle (lower energy levels are filled in first). So, if you're confused when you see, for example, 4s before 3d, this is just according to the principle.

There are several types of gases and have different forms and uses. Few of the most common gases are: Oxygen, Nitrogen, Fluorine, Chlorine, Carbon Dioxide, Methane and Sulfur Dioxide. Gases also classified into how many atoms they have.

Sn is a metal, it lies to the left of the semi-metal staircase

Quite honestly, there is no specific gas. Granted there are some chemical reactions that would create gases with halogens and H2O, but since you're being very vague on the specific halogen, I can't provide a specific answer. Not all halogens have large reactions with water. In fact, the government forces the American water supply to contain Fluorine (a halogen) to improve the dental health of the country.

Gold (AU) is an alkaline earth metal with a relative Atomic Mass of 196.97, an atomic number of 79 in group class 1B

The IUPAC, (International Union of Pure and Applied Chemistry), almost certainly have agreed on rules for describing by name a novel chemical compound.

This is quite a separate issue from trade names and trademarks.

X-ray diffraction is an investigative technique that involves directing a beam of X-rays at a material and examining the ways in which those X-rays were scattered by that material. The patterns into which they scatter and the angles of scattering reveal information about the structure of the material being studied. The application of X-ray diffraction to probe characteristics of a material allows a researcher to model the atomic or molecular structure of that material.

The actinides are a series of 15 radioactive elements, the group gets its name from the element Actinium. The elements are Actinium, Thorium, Protactinium, Uranium, Neptunium, Plutonium, Americium, Curium, Berkelium, Californium, Einsteinium, Fermium, Mendelevium, Nobelium and Lawrencium. Six of the elements of this group got their names from renowned scientists, Curium was named after Marie and Pierre Curie; the Einsteinium was named after Albert Einstein; Fermium was named after Enrico Fermi; the Mendelevium was named after Dmitri Ivanovich Mendeleev; the Nobelium after Alfred Nobel and Lawrencium is named after Ernest Lawrence.

Atomic radius decreases across a row (increasing positive charge in the nucleus causes electrons in the same energy level to "shrink" into the nucleus due to electrostatic attraction). This means that potassium has the largest atomic radius in period 4.

'Ba' stands for Barium in the periodic table. It is a soft, silvery alkaline earth metal that is commonly used in a variety of industrial applications, such as in the manufacture of fireworks and glass.

The columns on a periodic table are called "groups" or "families." These columns contain elements with similar chemical properties due to their shared number of electrons in the outermost energy level.

Ionic compounds are typically formed between a metal and a nonmetal. They have high melting and boiling points, are soluble in water, and conduct electricity when dissolved in water or as a molten state due to the presence of free ions. Additionally, they tend to have a crystalline structure and are usually hard and brittle.

The atomic bomb was developed during World War II as part of the Manhattan Project in response to fears that Nazi Germany was developing similar weapons. It was ultimately used by the United States on the Japanese cities of Hiroshima and Nagasaki in 1945 in an effort to bring a swift end to the war.

Caffeine > Acetaminophen > Ibuprofen > ASA

Actually ASA is more polar than Ibuprofen. In ethanol ASA rf value is around .7 and Ibuprofen is around .77.

Should be Caffeine > Acetaminophen > ASA > Ibuprofen

Rf in ethanol Caffeine < Acetaminophen < ASA < Ibuprofen

Aluminum is not a diatomic molecule. As the term implies, a diatomic molecule is made up of only two elements which can either be the same or different.

Bismuth

Francium has the largest atom - the greatest atomic radius.

Arsenic is in row 4 on the periodic table. It is located in Group 15 (VA) and Period 4.

Dmitri Mendeleev noted that elements displayed periodicity in their properties, with similar properties occurring at regular intervals when elements were arranged in order of increasing atomic mass. He also recognized that there were gaps in the sequence of known elements, which led him to predict the properties of undiscovered elements.

Probable lanthanum.
The chemical reactivity (and electronegativity) are very similar for lanthanoids. This explain the difficulties of identification and separation.

the symbol for gold is Au

Mendelevium is a synthetic element and its odor has not been specifically documented. However, like most heavy elements, it is likely odorless due to its radioactivity and would not be present in quantities large enough to have a detectable smell.