Periodic Table

Non-metals are located on the upper right side of the periodic table, predominantly in groups 14, 15, and 16. They are characterized by properties such as poor conductivity, dull appearance, and brittle texture. Examples of non-metals include oxygen, nitrogen, carbon, and sulfur.

In order from top to bottom in the block:

(1) the atomic number;

(2) the symbol used in chemical formulas;

(3) the name;

(4) the relative atomic mass.

To find the covalence of nitrogen in dinitrogen pentoxide, you first need to determine the total number of valence electrons for the molecule. Dinitrogen pentoxide has a total of 10 nitrogen atoms, each contributing 5 valence electrons. By sharing electrons with the oxygen atoms through covalent bonds, the nitrogen atoms achieve an octet, resulting in a covalence of 4 for each nitrogen atom in dinitrogen pentoxide.

The period number of molybdenum is 5. Period numbers in the periodic table indicate the energy levels or shells in which the elements' electrons are located. Molybdenum has 5 electron shells.

According to me the atomic size of an atom increases or decreses with the change in the number of shells. As atomic size is defined as the distance between the nucleus and valence shell of an atom. So, the addition of an electron does not effect the atomic size. As we can see in the periodic table that while moving along a group the number of electrons increases along with increase in no. of shells, while the atomic size tends to be increase with addition of shells and neglecting the addition of electrons. Same is the case while moving along a period. Atomic size decreases while the attraction between increased nuleus charge increases . Thus the size of the atom decreases.

The elements in the periodic table are classified mainly as metals, nonmetals, and metalloids. Metals are typically shiny, malleable, and good conductors of heat and electricity. Nonmetals are typically poor conductors of heat and electricity, while metalloids have properties that are in between metals and nonmetals.

Joseph Priestley did not contribute directly to the periodic table. He is known for his discovery of oxygen and several other gases, as well as his work on the chemistry of combustion and respiration. The periodic table was developed by Dmitri Mendeleev in 1869 based on the properties of known elements at the time.

The family of inert gases on the right side of the periodic chart is known as the noble gases. They include helium, neon, argon, krypton, xenon, and radon. These gases are characterized by their low reactivity and stable electron configuration.

No such symbol as 'PA' on the Periodic Table. However I think you mean 'Pa' Protactinium'. 'P' could be the element phosphorus, but there is no element with the letter 'A'.

NB When writing up chemical symbols remember the rules;-

#1 Single letter elements , always have a CAPITAL letter.

#2 Two letter elements, always have a capital letter to start and the second letter is ALWAYS small case.

Here are some examples.

H - Hydrogen ,

O - Oxygen

N - Nitrogen

Na - Sodium (Nadium)

Cu - Copper (Cuprum)

Cl - Chlorine

If you do not correctly write the chemical symbol, there could be confusion as to what substance is being referred . e.g. 'CO' - Carbon Monoxide and 'Co' - Cobalt.

Elements in group 17 (halogens) are not typically reactive because they have a full outer electron shell with 7 valence electrons, making them very stable. Their high electronegativity and tendency to gain one electron to achieve a full outer shell also contribute to their low reactivity.

This is known as participant observation, a research method commonly used by sociologists to study groups from within, gaining a more in-depth and firsthand understanding of their behaviors, norms, and interactions. By immersing themselves in the group dynamics, sociologists can gather rich data that may not be accessible through other methods.

Dmitri Mendeleev is credited with first organizing the elements in 1872. He created the periodic table, arranging elements by atomic mass and properties, and left spaces for elements that had not yet been discovered. His work laid the foundation for the modern periodic table used today.

A compound contains more than one kind of element. Compounds are made up of two or more different elements that are chemically bonded together. This differs from elements, which are pure substances made up of only one type of atom.

Noble gases, which have 8 valence electrons, tends to stay within their own fundamental forms.

Now (January 2012) the periodic table of Mendeleev contain 118 chemical elements.

I assume you're talking about the periodic table. Group 18 are the noble gases, they have a full outer shell of 8 valence electrons, thus they are alreadystable. Every other element tries to have a full outer shell like the noble gases.

there are five element in group 16 of the periodic table

The water table is present below the Earth's surface within the zone of saturation, where surface water infiltrates and fills the spaces between rocks and soil. Its depth can vary depending on factors such as geology, climate, and human activity.

The alkali metals family correctly labels the elements in group 1 on the periodic table. This group includes elements such as lithium, sodium, and potassium.

yes, it is in there to give you energy! :)

The periodic table organizes all of the elements by their physical and chemical properties, so elements with similar properties go in the same vertical column, or group or family, i.e. the Alkali earth metals are the first column of the periodic table, all of the elements in that group are highly reactive with water, and will either fizzle or explode when dropped in water. Therefore, scientists can use the other elements in a group to predict the properties of another element in the group that they do not know about.

Also, there are periodic trends in the horizontal rows of the table, called periods. For instance, the atomic radius of the elements is the biggest on the left, and gradually gets smaller as you move to the right.

Hope this helps! :)

Dimitri Mendeleev arranged the known chemical elements into a systematic chart known as the Periodic Table. By organizing the elements by atomic number and properties, this table allows for predictions of the behavior and characteristics of elements within each group.

The symbol on the periodic table means the abrevitation of the chemical element. For example, the chemical element symbol Pm stands for Promethium.

Element names come from a variety of sources. * Some of them are traditional names (silver, gold, sulfur) predating the modern notion of elements. * Some of them are named after their properties (oxygen comes from a phrase meaning "acid former" since it is present in many mineral (and all organic) acids; caesium comes from a word meaning "sky blue" for the color of a line in its emission spectrum). * Some of them are named after the material or location where they were first discovered (helium comes from a word meaning "sun" since it was first discovered by its emission lines in the solar spectrum; samarium comes from the mineral samarskite, from which it was first isolated. * The most recent trend is to name them after scientists (einsteinium, curium, seaborgium). Element symbols are usually abbreviations of the name in some sense. The basic rules are "no repeats, no more than two letters, first letter capitalized, second letter (if there is one) lower case" and beyond that it's pretty much anything goes. The abbreviation may not be related to the name of the element in English; for several elements it comes from the Latin name and in at least one case (tungsten) the abbreviation comes from the German form of the name: W, for wolfram. For elements that have not yet been discovered and/or given official names, there are placeholder names and symbols based on the digits in the atomic number. The digits zero through nine are represented by nil, un, bi, tri, quad, pent, hex, sept, oct, en and the (three-letter) abbreviation is the first letter of each digit. In this scheme, element 118 is ununoctium with symbol Uuo.