Beryllium (Be): 1sC2sD, what's C and D?
2 answers:
Answer:
C is equal to 2 and D is equal to 2.
Explanation:
Here C and D represents number of electrons in 1s and 2s orbitals.
Be has 4 electrons. Now, in order write electronic configuration of an atom, electron filling should be started from orbital with lowest energy.
Energy order of orbital with increasing energy: 1s< 2s< 2p< 3s< 3p< 4s< 3d....
So, filling of electron should start from 1s orbital then 2s, 2p, 3s, 3p and so on.
Each orbital can have maximum of 2 electrons.
So electronic configuration of Be is:
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The half life of the substance is 8 hours , Option D is the correct answer.
<h3></h3>What is Half Life ?
Half-life is the time required by an unstable element to reduce to half of its initial value.
The term is commonly used in nuclear physics.
The formula is
N(t) = quantity of the substance remaining
N ₀ = initial quantity of the substance
t = time elapsed
= half life of the substance
The data given in the question is N ₀ = 800 moles , N(t)= 100 , t= 24 hours
Substituting values in the equation
Therefore half life of the substance is 8 hours , Option D is the correct answer.
To know more about Half Life
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Answer:
The energy profile for rotation about the C-C bond in ethane is shown in the image, along with the Newman projections of the corresponding ethane conformer.
Explanation:
If you see the ethane molecule (second image) from the C-C bond axis (third image), as in the Newman projections, it's easy to draw an angle between one of the hydrogen atoms of the visible carbon, the carbon itself, and one of the hydrogens of the hidden carbon.
When you make a rotation about the C-C bond, the angle between those hydrogens will change. If you start with an eclipsed conformation, with each hydrogen of the hidden C exactly behind the hydrogens of the visible C, the angle will be 0°, or also 120° or 240°, as this rotations will be equivalent. On the other hand, if the angle is 60° (or 180°, or 300°), you will have a staggered conformation. The eclipsed conformation is less stable than the staggered one, because the interactions between hydrogens will be bigger (the repulsion between their electrons), and because of that the eclipsed conformations will be found in the maxima, while the staggered one will be found in the minima.
