<span>Energy is absorbed and then released to form an emission line.
When electrons absorb energy they increase there energy level. This is only temporary and the excited electron then relaxes back down to its original energy level releasing energy.
The energy is released in form of EM radiation of a specific frequency depending on the element and how many energy levels the electron relaxes.
This forms an emission line.</span><span />
<span>The s sublevel has just one orbital, so can contain 2 electrons max. The p sublevel has 3 orbitals, so can contain 6 electrons max. The d sublevel has 5 orbitals, so can contain 10 electrons max. And the 4 sublevel has 7 orbitals, so can contain 14 electrons max.
So, having this in mind, 10 electrons in total can be contained in the 4d sublevel.
</span>
Answer:
ΔE negative,ΔE positive,ΔE positive
Explanation:
Internal energy change of a system is positive when the system acquires energy from outside and internal energy change is negative when energy is being liberated from the system.
a Sweat evaporates from skin,cooling the skin ΔE is negative as heat energy is liberated through evaporation of sweat.
b A balloon expand against an external pressure ΔE positive because external energy is required to expand the balloon.
c An aqueous chemical reaction mixture is warmed with an external flame ΔE is positive because heat energy is provided by the external flame to warm the aqueous chemical reaction.
Answer: The correct answer is that the valence electrons are shared equally between C and H-atoms.
Explanation: In
molecule, 1 Carbon atom combines with 4 Hydrogen atoms to form 4 covalent bonds.
The electronic configuration of C-atom = ![1s^22s^22p^2](https://tex.z-dn.net/?f=1s%5E22s%5E22p%5E2)
The electronic configuration of H-atom = ![1s^1](https://tex.z-dn.net/?f=1s%5E1)
From the electronic configuration, we see that, the C-atom is short of 4 electrons and when it combines with 4 H-atom having 1 electron in its valence shell, both the atoms shares electrons equally in order to attain stable electronic configurations.