Periodic Table

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The diatomic element in period 1 of the periodic table is hydrogen (H). It exists as H2, meaning two hydrogen atoms are bonded together.

It is not necessary to memorize the periodic table. It would essentially be a waste of time for a number of reasons. First, if you need to find an element, the periodic table is readily available. It can be found in any science book, on a lab wall, or online. Secondly,, its not necessary to memorize the table because nobody deals with all the elements, only a certain group. And third, the more the table is used, the more familiar you become with it and finding what your looking for becomes easier. For instance, in just a short time, I already know that non-metals are on the right, metalloids are just to the left of non-metals, and metals are all the elements to the left. It is more important to learn how to use the table and where to look for something than it is to memorize it.

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Copper, Silver and Gold are the traditional "coinage metals".

However many modern coins around the world contain nickel because it's relatively inexpensive and very resistant to wear. Low denomination coins are often made of plated steel or zinc, while brass alloys are used to give higher-denomination coins a golden appearance.

In a wide form periodic table, cadmium is in period 5 and column 12.

The element is Neon. Neon is a chemical element with the symbol Ne and atomic number 10, and is used in neon lighting. Dodge Neon is a compact car produced by Dodge from 1994 to 2005.

The atom with 8 neutrons and 6 protons would be carbon-14, a radioactive isotope of carbon.

That table or chart would be the "Periodic Table" commonly found in any good chemistry text book.

The periodic table provides information on the elements, including their atomic number, symbol, name, atomic mass, and electron configuration. It also categorizes elements into groups based on shared characteristics and properties.

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.

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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.