Answer:
ELEMENTS MIXTURE
Elements are made up of one kind of atoms. Mixtures are made up of two or more kinds of Compounds .
Elements cannot be broken down into simpler substances by any physical or chemical method. The various constituents are seperated by simple physical means
Answer:
The move from Level n=3 to Level n=2 has the long wavelength.
Explanation:
First, due to the selection rules, only transitions between adjacent levels are allowed, thus, only a transition between Level n=3 to Level n=2 or Level n=5 to Level n=4 are allowed. The two first options are wrong.
Second, analyzing the transition between Level n=3 to Level n=2 and the transition between Level n=5 to Level n=4 it is necessary to think in terms of the equation of the difference of energy for these type of transitions:
Δ (1)
The difference in energy (ΔE) is directly proportional to the quadratic difference between the 'n' levels of transition. Therefore, If the transition occurs between smaller 'n' levels the difference of energy will be smaller too.
Also, the energy (ΔE) is inversely proportional to the wavelength (λ) so a smaller energy means a larger wavelength.
ΔE = c / λ (2)
Hence, the move from Level n=3 to Level n=2 has a long wavelength.
In order to calculate this wavelength is necessary to replace the data on equation (1) and (2).
The answer is c because it is going to the light bulb
The metals are elements which have low ionization potential and can lose electrons easily
the other physical characteristics associated with them and hence with Aluminium are
a) they can conduct electricity in molten state, hence It would only conduct electricity if it were melted.
b) It could be stretched into a thin wire. It means it is ductile.
In case of given aluminium metal the correct answer is
it could be stretched to thin wire
The question is all about which among the given choices is true or properly describes the valence electron of the metallic bonds. These valence electrons of the metallic bond is shared amongst many atoms so that the metals can be bounded together. Hope this answers your qn. :)