Periodic Table

The sum of the masses of oxygen and hydrogen is determined by adding their atomic masses. Oxygen has an atomic mass of approximately 16 g/mol, and hydrogen has an atomic mass of approximately 1 g/mol. Thus, the sum of the masses of oxygen and hydrogen is approximately 17 g/mol.

In the case of the letter "e" changing position when a slide to the left is made, it could be due to how the font or design of the text is programmed or displayed. When the text is moved left, the letter "e" within that text shifting to the right is likely a result of the specific coding or formatting of the text element.

Dmitri Mendeleev did not think gold and silver were alkali metals. He classified gold and silver as transition metals in his periodic table based on their chemical and physical properties. Alkali metals are a different group of elements.

Mendeleev arranged the periodic table according to increasing atomic mass. This method has been used since he first developed it in the 1800s.

John Newlands first published his "Law of Octaves" in 1863. It pointed out a recurrence of properties for every eighth element in a scheme involving just 21 of between 55 and 60 elements known at the tiime.

Two years later he presented to the Chemical Society in London a scheme that involved nearly all of the known elements. However he tried to 'force fit' elements into this scheme with little insight, and some of the family groupings are nonsensical.

Mendeleev's Periodic Law was published in 1869. His first periodic table that went with it at the time was followed by a revised version in 1871 which incorporated all known element, and left gaps for elements yet to be discovered.

s,p,d and f are designations for the four different types of subshells.

s is spherical in shape and has only one orientation in three dimensional space.

p has a dumbbell shape and has three orientations:

Px, Py and Pz.

d has a double dumbbell shape and has 5 orientations. Dxy, Dyz, Dxz, Dx2-y2, Dz2

f has a complex shape and has 7 orientations.

Each orbital can hold 2 electrons. s having only 1 orientation can hold only 2 electrons. p having 3 orientations, has 3 orbitals, each having the capacity to hold 2 electrons, so it can totally hold (3X2=) 6 electrons.

Similarly d can hold (5X2=) 10 electrons and f can hold (7X2=) 14 electrons.

The letters s, p, d, f respectively stand for sharp, principal, diffused and fundamental.

In the periodic table depending on which sub-shell is the valence shell (outermost) we have the spdf blocks.

The s-block is the alkali metals and alkaline earth metals.

The p-block is the non-metals and metalloids.

The d-block has the transition metals.

The f-block has lanthanides and actinides(mostly radioactive).

carbon, nitrogen, oxygen, sulfur,selenium, and phosphorus are all in the same group

Nitrogen has a higher electron affinity than phosphorous. This is because nitrogen has a stronger attraction for additional electrons due to its smaller atomic size and higher effective nuclear charge.

Group 18 elements, also known as the noble gases, are colorless, odorless, and tasteless gases. They are nonreactive due to their full outer electron shells, which results in high ionization energy and electronegativity. These elements exist as monatomic gases in their natural state.

In this instance, it becomes a singly negative ion.

The unit dalton, used for masses on an atomic scale, and known a few decades ago as a.m.u., is abbreviated Da. (upper case D, lower case a). So, for example, the mass of a single molecule of bovine serum albumin is approx. 68,000 Da.

According to mendeleef,groups are written in roman numerals,I to VIII,with A and B series.VIII-B group contains 3 columns.But according to IUPAC(international union of pure and applied chemistry)the groups are named 1 to 18(not in roman numericals).

Each row in the table contains elements that have the same number of electron orbit shells. The first orbit, which is closest to the nucleus only has space for 2 electrons (no idea why, sorry). This is why only hydrogen (1 electron) and helium (2 electrons) are in the first row.

The second row has the same inner shell, with 2 electrons and an outer shell with room for 8...and so on.

To arrange a store effectively, consider the store layout to create a logical flow for customers, group similar products together, ensure that products are clearly labeled and displayed at easy-to-reach heights, regularly replenish stock, and create eye-catching displays to draw attention to featured items. Additionally, consider the customer's shopping journey and aim to make their experience pleasant and efficient.

Group 1 elements are very reactive, so they quickly react with other elements to form compounds in nature. This makes it rare to find them in their pure elemental form in nature. They are usually found combined with other elements like oxygen and chlorine.

A good group performance typically involves clear communication, collaboration among group members, well-defined roles and responsibilities, effective time management, and rehearsal/practice sessions to ensure coordination and coherence. Feedback and reflection after the performance can also help improve future group engagements.

A hydrocarbon is a compound made up of hydrogen and carbon atoms. In symbols, hydrocarbons are often represented as CxHy, where x and y represent the number of carbon and hydrogen atoms in the molecule, respectively.

Mixing radium and silver would not result in a chemical reaction since both elements are relatively stable and unreactive. Radium is a radioactive metal while silver is a noble metal, so they would likely remain in their elemental form and not undergo any significant chemical changes when mixed together.

No, the most reactive metals are typically found on the left-hand side of the periodic table, in groups 1 and 2. These metals, such as alkali metals and alkaline earth metals, readily lose electrons to form positive ions.

Yes, a double displacement reaction can still occur even if the products are highly soluble or highly ionized. The reaction will still involve the exchange of ions between the reactants, leading to the formation of new compounds. High solubility or ionization may affect the rate of the reaction but will not prevent it from occurring.

No, the elements helium and neon have no known nor likely compounds with any degree of stability at all.

Many of the artificial elements cannot in practice be used to make compounds, because they live for too short a time before their radioactive decay to another element. We do know in theory what sorts of compounds they might make, and many of their likely properties.

To find the number of outer electrons in an element, or valence electrons, look on the Periodic Table of Elements. Look at the last number of the electron configuration. An element that has an electron configuration of 2-7 has 7 valence electrons.

Link to a periodic table of elements with electron configuration: http://www.chemicalelements.com/show/electronconfig.html

The heaviest stable element is bismuth, atomic number 83, atomic weight 208.9804). Any heavier element is radioactive, which means it decays into lighter elements - uranium, the heaviest naturally occurring element, will eventually decay into lead-207.

you're mom because she has sodium for protection