Answer:
KBr (aq) is a mixture.
Explanation:
Mixture is defined as the combination of two non reacting species. Let's discuss each option one by one.
a) Br₂(l):
This Bromine is not a mixture because the bracket specifying the state of Br₂ is liquid. Hence, as bromine is a liquid at room temperature, so this compound is purely Br₂.
b) KBr (s):
KBr is also present in pure form because in bracket solid is written.
c) K (s):
Potassium is also present in pure form as the bracket is specifying solid, as KBr is solid at room temperature.
d) KBr (aq):
This is a mixture of KBr and water. Because KBr being an electrolyte when dissolved in water it is hydrated as follow,
KBr (s) -----water------> K⁺ (aq) + Br⁻ (aq)
Answer : The ground-state electronic configuration of oxide ion is,
Explanation :
Electronic configuration : It is defined as the distribution of electrons of atom in an atomic orbital.
<u>Oxygen</u>
The total number electrons in oxygen = 6
The electronic configuration of oxygen is,
<u>Oxide ion</u>
The total number electrons in oxide ion, = 6 + 2 = 8
The charge on O is (-2). So, we are adding 2 electrons.
The electronic configuration of oxide ion is,
If 25% is remaining, two half lives have occurred.
After one half life, 50% remains. The after a second, 25% remains
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In a transverse wave, the particles are displaced perpendicular to the direction the wave travels. ... In a longitudinal wave the particles are displaced parallel to the direction the wave travels. An example of longitudinal waves is compressions moving along a slinky.
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Makes it seem bigger and brighter