Periodic Table

The Nobel Gases are helium, neon, argon, krypton, xenon, and radon. They are located in Group 18 of the periodic table, also known as the noble gases or Group 8A. They are colorless, odorless, and generally inert gases with low boiling and melting points.

One mole of bromine (Br2) weighs approximately 159.808 grams.

The horizontal rows on the periodic table are called periods. There are 7 periods in total, each representing a different energy level or shell of electrons in an atom. Moving from left to right across a period, the number of protons and electrons increases, resulting in an increase in atomic number.

Elements in family 1 are very reactive because they have one electron in their outermost shell, making them highly likely to lose that electron to achieve a stable electron configuration. This results in the formation of positive ions, which allows these elements to readily bond with other elements to achieve stability.

The atomic number is the number of protons in the nucleus of an atom. In electrically neutral atoms, the number is also equal to the amount of electrons orbiting around the nucleus of the atom. The higher the atomic number the heavier the atom. The atomic number of silver is 47 and therefore number of protons/electrons is 47. It has 67 neutrons.

Elements that have many similar properties belong to the same group on the periodic table. Each group shares similar chemical characteristics due to their same outer electron configuration.

The family name for nobelium is the actinide family.

To find the hydroxide-ion concentration, we first need to find the concentration of hydronium ions ([H3O+]) using the formula pH = -log[H3O+]. For a solution with pH 4.72, [H3O+] is 10^(-4.72) mol/L. Since water auto-ionizes to form equal concentrations of hydronium and hydroxide ions, the hydroxide-ion concentration is also 10^(-4.72) mol/L.

A mole is Avagadro's number (6.0221415 × 10^23) atoms of any particular element. Therefore a mole of hydrogen contains 6.0221415 x 10^23 atoms of hydrogen.

iodine= (I)

atomic number=53

atomic mass=126.90447amu

no. of protons=53

no. of neutrons=74

Steel, bronze, and brass are not found in the periodic table because they are alloys, which are mixtures of two or more elements, with at least one being a metal. Steel is an alloy of iron and carbon, while bronze is an alloy of copper and tin, and brass is an alloy of copper and zinc. These alloys do not have individual entries in the periodic table because they are combinations of elements.

Some elements have symbols with two letters because their names are derived from non-English or Latin origins. For example, the symbol for sodium is Na, which comes from the Latin word "natrium." Using two letters helps to uniquely identify each element and avoid confusion.

Argon, Ar, has the atomic number of 18 on the Periodic Table of Elements.

Rutherfordium is a member of the transactinides family; group 4 and period 7 in the Periodic Table of Mendeleev.

Potassium is a very reactive Alkali metal, which will even react with water present in the air. For this reason nothing is "made" from it. Its soluable salts and compounds are used for many purposes, including the production of fertilizers. Potassium nitrate was widely used to preserve foodstuffs and is also a main component of gunpowder. yh lol,

Copper, along with the other members of group 11A (gold and silver included) are unreactive metals because of their electron configuration. The s subshell promotes one of its electrons to the 3d subshell, giving it a filled 3 subshell and only one electron in its outer 4s subshell. Therefore, there is no electron-electron repulsion in the outer subshell, making all electrons rather stable in comparison to all other metals.

The reactivity of non-metal elements generally decreases as you move from left to right across groups 13-17 of the periodic table. This is because the elements have an increasing number of valence electrons and are closer to achieving a stable electron configuration. Non-metals in group 17 (halogens) are the most reactive due to their high electronegativity and affinity for gaining electrons to achieve a full outer shell.

The element with an atomic number of 36 is krypton. It is a noble gas that is colorless, odorless, and tasteless. Krypton is commonly used in lighting, such as in fluorescent lights and photographic flashes.

The atomic number of an element is the number of protons contained within the nucleus of an atom of that particular element. Since each element has a different number of protons, elements can be placed into a table based on the number of these particles.

Yes. Radium is a radioactive element that is found in small amounts in uranium ores. Radium, like all other radioactive materials, is dangerous if handled improperly. It was most famously used in luminescent paints. There was a lawsuit filed against their employers by five dying women who, uneducated about the dangers of radioactive Radium, were hired to use the paints to make the faces of glow-in-the-dark watch faces for the military. The radium in the paint seeped through their skin into their bodie and they suffered from bone cancer and anemia. Radium, once in the body, is treated as calcium and transfered to the bones where its radioactivity degrades the marrow, reducing blood production and possibly mutating bone cells.

Potassium is in group 1 and the group elements are hydrogen, lithium, sodium, potassium, rubidium, cesium, francium

Thorium is a member of the actinoids family and is placed in period 7.

Yes.

Gold is an element which exists in nature, as pure, solid gold. Because it is quite inert and unreactive, gold does not easily give up electrons (i.e. is not easily oxidised) and hence it does not readily form compounds in nature, rather it exists in its elemental form. For example, zinc is a more reactive metal than gold and more readily gives up electrons to form ions, and hence it is often found in nature as a ZnO (solid) or ZnS (zinc sulfide - solid) compound.

As an ion, gold is readily reduced (i.e. gains electrons) to form solid, elemental gold.

The 107th element in the periodic table is Bohrium (Bh). It is a synthetic element, which means it is not found naturally and has to be created in a laboratory. Its atomic number is 107, and it is classified as a transition metal.

Group VII A in the periodic table is known as the halogens, which include elements such as fluorine, chlorine, bromine, iodine, and astatine. These elements are highly reactive nonmetals that form salts when they react with metals.