Circumpolar stars
Explanation:
Stars which appears to revolve around the Polaris and do not set or go below the horizon are called circumpolar stars.
In short, this stars circles the pole.
- Circumpolar stars are not found at the equator.
- These stars do not set and they are visible at the north poles.
- The simply stay as the earth spins on its axis.
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Answer:</h3>
Al- [Ne] 3s²3p¹
As- [Ar] 4s²3d¹⁰ 4p³
Explanation:
- Electron configuration of an element shows the arrangement of electrons in the energy levels or orbitals in the atom.
- Noble-gas configuration involves use of noble gases to write the configuration of other elements.
- This is done by identifying the atomic number of the element and then identifying the noble gas that comes before that particular element on the periodic table.
- Aluminium: The atomic number of Al is 13. The noble gas before Aluminium is Neon which has 10 electrons. Therefore the remaining 3 electrons fills up the 3s and 3p sub orbitals.
- Thus, the noble-gas configuration of Al is [Ne] 3s²3p¹
2. Arsenic, Atomic number is 33
- Noble gas before Arsenic is Ar,. Argon has 17 electrons, then the remaining electrons fills up the 4s, 3d and 4p sub-orbitals.
- Thus, the noble-gas configuration of As is [Ar] 4s²3d¹⁰ 4p³
This material is considered a “hard” material, usually having a high numerical value on the Mohs scale of hardness.
M = n/V
M = 1.39 mols/50 L = 0.0278
M = 2.23 mols/50 L = 0.0446
M= 0.985 mols/50 L = 0.0197
M= 2.74 mols/50 L = 0.0548
M= 4.56 mols/50 L = 0.0912
Answer:
The answer is B - At dynamic equilibrium, the reactions continue but the amounts of reactants and products do not change.
Explanation:
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