Alkali metals impart characteristic colours to the flame due to low ionisation enthalpy, when an alkali metal or its salt is heated in a flame, the valence electrons are excited to higher energy level.
Answer:
The answer is
<h2>17.63 mL</h2>
Explanation:
The volume of a substance when given the density and mass can be found by using the formula

From the question
mass of lead = 200 g
density = 11.342 g/cm³
It's volume is

We have the final answer as
<h3>17.63 mL</h3>
Hope this helps you
Answer:
<em>Mass of oxygen needed for complete combustion of 6.90 x 10 -03 g CH4 = 2.753 x 10 -02 g</em>
Answer:
half life=16.5hrs
sample=2g
total time=1day=24hrs
no. of half lives=total time/half life
no. of half lives=24hrs/16.5hrs=1.45approx1.5
sample left=1/2n=1/2[1.5]=0.707gapprox
Explanation:
Answer:
No empty orbitals but five unpaired electrons.
Explanation:
Hello there!
In this case, when going over the empty orbitals in valence energy levels, it is required to develop the electron configuration in order to appropriately describe the element. In such a way, for the element whose atomic number is 25 because it equals the number of electrons, we obtain:

It means that the d orbital is half filled which means that it does not have any empty orbital wherein two electrons are contained per orbital. Moreover, we can find 5 unpaired electrons according to:
↑ ↑ ↑ ↑ ↑
Which is the orbital notation.
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