Periodic Table

Krypton is found in group 18 (Noble Gases) and period 4 of the periodic table. It has the atomic number 36 and is a colorless, odorless gas.

If the gas is confined by volume then the temperature must decrease. Given by the ideal gas equation pv=nrt on the left pressure time volume. If the volume is constant then the decrease in value of the left hand side of the equation has to compensated by a change in the right hand side. n= no of moles (a measure of the number of atoms present) R= gas constant so the only variable is T temperature which must decrease

Polar molecules align themselves in a field because they have a positive and negative end. When placed in an electric field, the positive end of the molecule will align towards the negative side of the field, while the negative end will align towards the positive side. This alignment helps to minimize the energy of the system.

All elements in group 7 of the periodic table, also known as the halogens, have 7 valence electrons. They are highly reactive nonmetals and readily form compounds with metals by gaining one electron to achieve a full valence shell. These elements include fluorine, chlorine, bromine, iodine, and astatine.

The group on the far right of the periodic table of elements will not bond to form compounds. These are the Noble Gases aka Inert Gases and are the elements of Group 18, which includes helium, neon, argon, krypton, xenon, radon, and element 118. I think that's all of them. I am not 100% confident that this list is entirely inclusive so there may be some other element(s) that do not form compounds. I am sure however that Noble Gases do not react due to the fact that their electron shells are full.

the elements of ist A group are highly reactive toward water (even withice) and form a strong alkaline solution, their reactivity is due to large atomic sizes and low I.P values.

Ionic compounds form between metals and nonmetals. In an ionic bond, electrons are transferred from the metal to the nonmetal, resulting in the formation of positively charged metal ions and negatively charged nonmetal ions which attract each other and form a stable compound.

Mercury is the metal that can be obtained from cinnabar. Cinnabar is a mineral form of mercury sulfide, and when heated, it decomposes to release elemental mercury vapor. Mercury is then condensed out of the vapor to obtain the metal.

Groups

AG stands for " Aktien Gesellschaft"

This is the way the company is organised; like Ltd in England or NV in the Netherlands

One potential change could be the addition of new elements beyond the current 118 elements as new discoveries are made. Another change could involve modifications to the organization or layout of the periodic table to better reflect the properties and relationships of elements. Additionally, advancements in technology and research could lead to a deeper understanding of atomic structure and properties, prompting updates to the periodic table.

The 10th element on the periodic table is neon, with the symbol Ne. Neon is a noble gas that is commonly used in neon lighting and advertising signs due to its bright, colorful glow when electrically charged.

the original periodic table was based on th elements it had

Mercury (Hg) and Bromine (Br) are two elements that are liquid at room temperature.

Yes, CaO is an inorganic compound because it does not have any Carbon in it.

There is no element with the name "fulcrum" on the periodic table. Elements on the periodic table are represented by their atomic number and chemical symbol. You may be thinking of an element that is near atomic number nine, which is fluorine (symbol F).

We assume 100 grams of the compound and turn those percentages into grams and get the moles.

50.7 grams antimony (1 mole Sb/121.8 gram)

= 0.41626 moles antimony

================================

Now, the smallest mole number (antimony) becomes 1 and the other number is divided by it(antimony) to get the empirical numbers.

0.62467 moles Se/0.41626 moles Sb

= 1.5

----------------so, this happens sometimes and this is what we do

(SbSe1.5)*2

= Sb2Se3

-----------------The empirical formula Antimony selenide

• very small relative to size of whole atom
• extremely dense
• highly positively charged

As you move from left to right across the second period of the periodic table, the atomic number increases. This leads to an increase in the number of protons in the nucleus, resulting in a stronger nuclear charge. This increased nuclear charge attracts electrons more strongly, leading to a trend of increasing electronegativity, ionization energy, and atomic radius from left to right.

The noble gases in Group 18 of the periodic table have a full outer shell of electrons, making them stable and chemically unreactive.

Water and mercury are two elements that are liquid at room temperature.

An autopsy table is usually made of stainless steel, with raised edges to contain fluids. It may have a drainage system to remove fluids, as well as adjustable height and tilt for optimal examination. It is also equipped with overhead lighting and may have additional features like scales, rulers, and slots for tools.

The transition metals group in the periodic table has more than one column. This group consists of elements in columns 3 to 12, and they exhibit similar properties including the ability to form colorful compounds and variable oxidation states.

It is unlikely to find naturally occurring radioactive elements in significant concentrations in limestone mines. However, trace amounts of natural radioactive elements like uranium and thorium may be present. For accurate information, it is recommended to conduct detailed geological surveys and analysis.