Periodic Table

The number 8 above the element symbol O on the periodic table represents its atomic number, which indicates the number of protons in an oxygen atom's nucleus. This helps identify the element as oxygen specifically among the other elements.

The halogens can be found in Group 17 (Group VIIA) on the periodic table. They include elements such as fluorine, chlorine, bromine, iodine, and astatine. These elements have similar chemical properties due to their outer electron configuration.

Iodine is located in the 17th group, also known as Group 7 or the halogens, of the periodic table. It has the atomic number 53.

SrCl2 is the molecular formula of the compound, strontium chloride. The periodic table will list elements and not compounds. However the elements Strontium (symbol Sr, group 2, period 5) and Chlorine (symbol Cl, group 17, period 3) are found on the periodic table

Periodic table lists elements and not compounds.

Out of the first 92 elements, 1 being hydrogen (H) and 92 being uranium (U), there are 90 that are naturally occurring. Technetium (Tc) and promethium (Pm) are man-made elements and do not have any isotopes occurring naturally.

The representative element in period 4 group 14 is silicon (Si). It is located in Group 14 of the periodic table, also known as the carbon group. Silicon is a metalloid that exhibits properties of both metals and nonmetals.

5th element - boron

6th element - carbon

7th element - nitrogen

8th element - oxygen

9th element - fluorine

10th element - neon

The ore that carbon is normally obtained from is ... coal!

There is a rather rare mineral made of pure carbon called ... diamond!

There is a large family of common minerals containing carbon, called carbonates, but they are never used as a source for elemental carbon. They include limestone (calcite, aragonite), dolomite, siderite, barite, cassiterite, cerussite, strontianite, etc.

112 elements have been named and additional 6 elements have been tentatively proposed.

Atoms on the periodic table are arranged in order of increasing atomic number from left to right and top to bottom. They are organized into groups and periods based on similar properties and characteristics. The periodic table helps illustrate trends in atomic structure and chemical behavior.

Ge stands for Germanium in the periodic table of elements. It is a metalloid element with atomic number 32. Germanium is commonly used in semiconductors and optical materials.

period 3 elements in the periodic table have 3 electrons in there outher shell hence the name.

Dmitri Mendeleev created the periodic table by organizing elements based on their atomic masses and properties. He left gaps for undiscovered elements and predicted their properties accurately. The final version of the table was published in 1869 and became the foundation for modern chemistry.

The seventeenth periodic element is chlorine, with the symbol Cl and atomic number 17. Chlorine is a highly reactive nonmetal that is commonly used in disinfectants and household cleaning products.

The halogens, located in Group 17 (Group VIIA), tend to have seven valence electrons. They require only one more electron to achieve a stable octet configuration, making them highly reactive.

One or two letters are used to represent the name of each element.

The metals and non-metals are separated by a "stair-step" pattern that begins between polonium and astatine and moves up/left to boron. Most periodic tables display this stair-step as a bold line, or a different color, or something else easy to spot. Generally speaking, the metals are everything to the left of the stair-step, and the non-metals are everything to the right. The small handful of elements that "ride" the stair-step are called metalloids. Metalloids can have properties of both metals and non-metals.

the metal that is liquid at room temperature is mercury

Dmitri Mendeleev worked alone while working on the Periodic Table and the Periodic Law. He stayed in close contact with other scientists around the globe, however, and received information and data that they had collected, and added it to his own notes to create a more accurate and agreeable set of data to help him arrange the elements.

Firstly, helium does NOT belong to group 8. In the periodic table used until around the 1960s, helium belonged to group zero. Iron cobalt, and nickel families shared group VIII. In the modern, iupac sanctioned periodic table, the noble gas family -- helium, neon, etc. -- are in group 18.

I think the reason your teacher (? or textbook, or whoever) has asked this question is because all of the other noble gases have 8 electrons in their outermost shell, while helium has only 2.

There is no specific chemical element symbol for salinity. Salinity refers to the concentration of salts in water, typically measured in parts per thousand (ppt) or practical salinity units (PSU).

Everything on and within the Earth, including the molecules that make up you, me, and everyone we have ever heard about and that will ever be, came from the heart of ancient stars, which more than 5 billion years ago exploded in interstellar space. That matter eventually coalesced into our Solar System. Some of it became our sun, some of it wanders our solar system as asteroids, and some of it formed a planet that would be called Earth. We are star dust.

Calcium=Ca=Atomic number 20

9+11=20