Iscotopes are usually stbolized in the following way:
X represents the chemical symbol
A rep Z represents the atomic number.
Electrons cannot be located between levels except when they are in the process of moving.
The limitation of the maximum number of electrons in a given energy level can be used to account for the periodic recurrence of properties as the number of electrons increases.
Explanation:
- The Bohr's model of the atom is based on quantum mechanics.
- He suggested that electrons are contained in specific spherical orbits around the nucleus.
- The orbits are also known as shells or energy levels.
- The maximum number of electrons that can be contained by an energy level is 2n².
- An electron in an energy level has a definite amount of energy associated with it at that level.
- Electrons can undergo transitions from one level to another.
Learn more:
Bohr's mode of the atom brainly.com/question/4986277
Atomic model brainly.com/question/2965079
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Answer:
Calcium carbonate
Explanation:
Ionic compounds that tend to have one or more polyatomic ions are the ones that tend to exhibit both ionic and covalent bonding. The only one that meets this is calcium carbonate.
<span>She must use Avogadro's Number. Avogadro's number is the number of molecules in a mole of a substance, so if you have 12.4 moles of something, then you have 12.4 times Avogadro's number of molecules.</span>
Answer:
C) is less than 7
Explanation:
The dissociation constant, Ka of nitrous acid, HNO2 = 4.5 * 10^-4
Ammonia, NH3, is a weak base with a Kb value of 1.8x10^-5
When a weak acid like HNO2 reacts with an equivalent amount of a weak base NH3, complete neutralization does not occur. The concentrations of the species in equilibrium with each other will depend on the equilibrium constant, K, for the reaction,
Since the dissociation constant, ka of nitrous acid is higher, at equivalence point the pH of the solution will be slightly acidic with a pH that is less than 7.