Answer:
- <u><em>Option C) 1s² 2s² 2p⁵</em></u>
Explanation:
<em>Ground-state</em> is the configuration of the electrons when every electron of the atom occupies the lowest possible energy level.
The rank of energy of the orbitals may be remembered using Aufbau rules, and it is:
1s² < 2s² < 2p⁶ < 3s² < 3p⁶ < 4s² < 3d¹⁰ < 4p⁶ < 5s² < 4d¹⁰ < 5p⁶ < 6s² < 4f¹⁴ < 5d¹⁰ < 6p⁶ < 7s² < 5f¹⁴ < 6d¹⁰ < 7p⁶
Then, to find whether an electron configuration corresponds to a ground-state one, you must check that the previous order is preserved.
<u>Option A). 1s² 1p⁶ 2d²</u>
The orbital 1p does not exist. So this one is discarded.
<u>Option B) 1s² 2s⁴ 2p⁶</u>
The maximum number of electrons in an s orbital is 2, so 2s⁴ is impossible, and this option is discarded.
<u>Option C) 1s² 2s² 2p⁵</u>
This is correct because the orbitals are filled in the correct increasing energy order, without jumping any one.
<u>Option D) 1s² 2s² 2d⁶</u>
Orbital 2d does not exist, so this option is also discarded.
Answer:
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Explanation:
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Answer:
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Explanation:
question 44
the number 35 of bromine represents the atomic number
question 45
29 protons,
27 electrons
29-27 = +2
the charge on the following particle is
+2
The correct matches are:
1. Exosphere - Temperatures reach as high as 2000 C yet it feels very cold
This is the top layer of the atmosphere. The atoms are so dispersed that despite it having very high temperature it doesn't feel like it at all.
2. Thermosphere - Particles that have enough energy can escape into space
The thermosphere is the fourth highest layer of the atmosphere. The atoms in this layer are relatively distant from one another, so the particles that have enough energy manage to escape easily into the exosphere and then the space.
3. Mesosphere - It is the coldest region of the atmosphere
The mesosphere is the third highest layer. In this layer the temperatures constantly drop, and they go down to -85 degrees, making it the coldest layer by far.
4. Stratosphere - Ninety percent ozone is in this layer
The startosphere has a separte zone in it which is dominated by only one gas, the ozone. It is called the ozone layer, the one that protects the Earth from too intense UV radiation, and in fact over 90% of this gas is locate here.
5. Troposphere - It is warm due to the heat from Earth's surface
The troposphere is the densest and lowest of the layers. It is the one that also has Greenhouse gases which manage to trap the heat that is radiated from the surface of the Earth, thus keeping this layer relatively warm.
