Periodic Table

Mendeleev organized the elements in his table by increasing atomic mass and grouping elements with similar properties together. He left gaps in his table for unknown elements and accurately predicted the properties of these missing elements based on the patterns he observed.

a none of them

b every eighth elements

c all of them

d half of them

Filtering a mixture is necessary to separate the desired component from the unwanted solid particles or insoluble impurities. The filter allows the liquid or soluble component to pass through while trapping the solid particles, resulting in the desired product. This process helps improve the purity and quality of the final substance.

Fluorine is the most reactive nonmetal in period 2 of the periodic table.

Bromine and Chlorine both have equal chemical properties. They both have 7 electrons in the outermost energy level. They both gain 1 electron to get the noble gas configuration.

Cl and Br have same chemical properties. They have 7 valence electrons. They both are non-metals.

In the periodic table, the Group 2, Period 4 element is calcium. Calcium is classified as a silvery-gray metal. Calcium is the most abundant of the metallic elements in the human body.

The most common mistake is to calculate the slope incorrectly by dividing the change in x by the change in y instead of dividing the change in y by the change in x. This mistake can result in an incorrect slope value.

Na is sodium

Po is Polonium

Na and Po can not form a compound.

You must mean

"Na3PO4" otherwise known as TRISODIUM PHOSPHATE.

This molecule is made up of

Sodium = Na (3 atoms)

Phosphorous = P (1 atom)

Oxygen = O (4 atoms)

Thus Na3PO4 contains 8 atoms in total.

Therefore 2 of these 2(Na3PO4) or 2Na3PO4 must have 16 atoms present.

A table d'hôte menu is used in restaurants to offer a fixed-price meal with a set selection of courses. It is typically offered during specific times, such as lunch or dinner service, and provides customers with a complete dining experience at a set price. Table d'hôte menus are popular in fine dining establishments and can offer a good value for multiple courses.

they termed as lanthanide because the lighter elements in series are chemically similar to lanthanum

Non metals do not conduct heat. They have high resistance.They are insulators.

Non metals do not have a pool of 'free electrons' (as metals do with metallic bonds). Hence they generally are poor conductors of heat. Nonmetals such as Styrofoam are widely used as insulators. Graphite is an exception as it is a good conductor of heat with its free electrons.

Most of the non metals does not conductors because the do not have free electrons. But graphite is a good conductor. Most of the non metals are insulators.

The gaps in the periodic table provided a framework for scientists to predict the properties of undiscovered elements based on the trends and patterns observed in the known elements. By identifying missing elements in the periodic table, scientists were able to focus their search on regions where certain properties were expected based on the elements surrounding the gaps. This guided experimental efforts to discover and synthesize new elements.

The period number is equal to the number of energy levels. Elements of period 3 have 3 energy levels. Na,Mg,Al,Si are few elements in the period 3.

In cold temperatures, atoms move more slowly and their kinetic energy decreases, causing them to come closer together and form a solid if cold enough. This is because there is less thermal energy available to keep the atoms moving and apart from each other.

HgO has valency 2 .so,the roman numeral for HgO is:

HgO(II)

The periodic table of elements is divided into groups and periods. The groups (columns) are elements with similar chemical properties, while the periods (rows) represent the number of electron shells in an atom. The main subcategories include metals, nonmetals, and metalloids.

Every family is unique, and reactions can vary greatly based on individual circumstances. However, a family with a history of open communication, acceptance, and understanding may be less likely to react negatively.

Noble gasses are least reactive of all the elements. So the least reactive element in the period 4 is Krypton. It is a noble gas with an atomic number of 36.

Hydrogen will react with most elements because it has a tendency to donate its electron (oxidation) or accept an electron (reduction) to achieve a stable electron configuration. This reactivity allows hydrogen to form various compounds with other elements, creating a wide range of chemical reactions.

Bromine, group 17; Mercury, group 12. Both are liquids at STP

No group 18 element can react with fluorine under normal conditions, as they have a stable and inert configuration with full valence shells.

Non-matter in chemistry refers to anything that is not made up of atoms or molecules. This includes energy such as light, heat, or electricity, as well as phenomena like magnetic fields. While these entities play crucial roles in chemical reactions and processes, they do not have mass or occupy space like traditional matter.

The Element with the Chemical Symbol of Rb is Rubidium. Rubidium is a soft, silver-white metallic elements of the alkali metal group. (A#-37 and AM-85.4678)

The element represented is gadolinium (Gd). It has 54 electrons, with the electron configuration: [Xe] 6s2 4f7.