The nucleus of an aluminum atom has a charge of + 13 and is surrounded by a total of 13 electrons. Therefore, option (2) is correct.
Aluminum is a chemical element with atomic number 13 and the chemical symbol Al. Aluminum has 13 protons in its nucleus so it has +13 charge on its nucleus and thirteen electrons surrounding the nucleus of the aluminum.
Aluminum element has a low density and has a great affinity towards oxygen and forms a protective layer of oxide when exposed to air.
Aluminum is a post-transition metal placed in the p-block of the periodic table and forms compounds in the +3 oxidation state. The aluminum cation (Al³⁺) is polarizing in nature and forms metallic bonds to get its covalency in aluminum foil.
The atomic number of the aluminum atom is 13 therefore it has 13 electrons and 13 protons in its atom. The 13 electrons are present n the nucleus of an atom so the nucleus is positively charged.
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Answer: The given statement is true.
Explanation:
When solid state of water changes directly into vapor state then this process is known as sublimation.
For example, when dry ice is placed at room temperature then it converts into vapor state without undergoing liquid state.
Also when we apply very high pressure or temperature at the solid state of water, it will change directly into vapor state.
Therefore, the statement ice does not need to melt into liquid water before it can return to the atmosphere as water vapor is true.
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b. triple point.
c. lambda point.
d. freezing point.
A. In liters of water per moles of a dissolved substance
B. In liters of water per gram of a dissolved substance
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C. In moles of a substance for 1 g of that substance
D. In moles of a substance dissolved in 1 L of water
Answer:
D. In moles of a substance dissolved in 1 L of water
Explanation:
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Molarity is measured in moles of a substance dissolved in 1 L of water.
The molarity is measured in moles of a substance dissolved in 1 liter of water, so the correct option is D. In moles of a substance dissolved in 1 L of water. Molarity is a measure of the concentration of a solute in a solution. It is calculated by dividing the number of moles of solute by the volume of the solution in liters.
Molarity (M) is indeed a measure of the concentration of a solute in a solution and is defined as the number of moles of solute per liter of solution. This means it is measured in "moles of a substance dissolved in 1 liter of solution" or simply "moles/L" or "mol/L." Molarity is a fundamental concept in chemistry and is widely used in various chemical calculations and experiments to express the concentration of a substance in a solution.
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