Answer:
ice
Explanation:
uhh concrete has rougher surface
The answer a way of explaining a complex concept.
Answer:
2.13 x 10³moles
Explanation:
Given parameters:
Number of molecules in AlF₃ = 1.28 x 10²⁷molecules
Unknown:
Number of moles = ?
Solution:
A mole is a quantitative unit in chemistry used of taking measurements.
A mole of a substance is the amount of that substance that contains the avogadro's number of particles.
The particles can be molecules, atoms, neutrons, protons, electrons or formula units.
Number of moles =
Number of moles = = 2.13 x 10³moles
Answer:
Noble gases cannot form compunds as they have completely filled orbitals and have stable noble gas configuration
Answer:
4
Explanation:
Relationship between wavenumber and Rydberg constant (R) is as follows:
Here, Z is atomic number.
R=109677 cm^-1
Wavenumber is related with wavelength as follows:
wavenumber = 1/wavelength
wavelength = 253.4 nm
Z fro Be = 4
Therefore, the principal quantum number corresponding to the given emission is 4.