What is the chemical symbol of SE?
Se
Why is the symbol for selenium se?
The name derives from the Greek Selene, who was the Greek goddess of the Moon because the element is chemically found with tellurium (Tellus was the Roman goddess of the Earth). Selenium was discovered by the Swedish chemist Jöns Jacob Berzelius in 1817, while trying to isolate tellurium in an impure sample.
What is the name of SE element?
Selenium
What element is similar to se?
NonmetalMetalloidChalcogenPeriod 4 element
Is se a metal or nonmetal?
Selenium is a chemical element with the symbol Se and atomic number 34. It is a nonmetal (more rarely considered a metalloid) with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic.
Do OS and SE have similar properties?
Oxygen is in group 16/VIA, which is called the chalcogens, and members of the same group have similar properties. Sulfur and selenium are the next two elements in the group, and they react with hydrogen gas (H2) in a manner similar to oxygen.
Do N and P have similar properties?
Nitrogen and phosphorous are part of the same ‘family’ on the periodic table, group 15, also called the nitrogen group. Since phosphorus is just below nitrogen, we can expect nitrogen and phosphorus to have some similar properties. They are nonmetals and have similar properties when making compounds.
Which is the best example of a compound?
Examples of compounds include table salt or sodium chloride (NaCl, an ionic compound), sucrose (a molecule), nitrogen gas (N2, a covalent molecule), a sample of copper (intermetallic), and water (H2O, a covalent molecule).
Is sulfur similar to oxygen?
Because sulfur is directly below oxygen in the periodic table, these elements have similar electron configurations. As a result, sulfur forms many compounds that are analogs of oxygen compounds, as shown in the table below. O=O. double bonds are much stronger than S=S double bonds.
Is sulfur or oxygen a better leaving group?
Sulfur is a larger atom than oxygen, making its electrons more polarizable. Thus, it is a stronger nucleophile than oxygen. However, the pka of R-SH is 8.2 where as the pka of R-OH is 16. Thus, the SH group is a stronger acid than the OH.
What is the word equation for Sulphur and oxygen?
Revision questions
| Word equation | sulfur + oxygen → sulfur dioxide |
|---|---|
| Chemical equation | S + O2 → SO2 |
| Picture equation |
Is oxygen more stable than sulfur?
Oxygen is more reactive than sulphur it has less electrons and less shells. In Group 6, in order to become stable or to react, elements must gain electrons. In this case, the closer the outer electrons are to the nucleus, there will be more attraction and therefore, an increased chance of it gaining an electron.
What type of bond is sulfur and oxygen?
covalent bonding
Is sulfur or oxygen more electron withdrawing?
According to me, sulphur is less electron withdrawing than oxygen (electronegativity decreases down the group), so the carbon adjacent to oxygen must be more electrophilic.
Which is the strongest deactivating group?
The strongest deactivating effect on aromatic ring is due to presence of trichloromethyl group (−CCl3).
What is the most deactivating group?
-CF3
Is group A activate?
If electrophilic aromatic substitution of a monosubstituted benzene is faster than that of benzene under identical conditions, the substituent in the monosubstituted benzene is called an activating group. Thus, the methyl group is an activating group. All activating groups are electron-donating groups.
Is aldehyde activating or deactivating?
A carbonyl group such as an aldehyde is a deactivating group as it withdraws electron density by both the inductive effect (through the sigma bonds) and the resonance effect which involves pi systems.
Which are the deactivating group?
In organic chemistry, a deactivating group is a functional group attached to a benzene molecule that removes electron density from the benzene ring, making electrophilic aromatic substitution reactions slower and more complex relative to benzene.