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3. The atomic number of niobium (...
Chemistry, 25.05.2021 05:10 nanakwameyeb
Question 3 of 20 :
Select the best answer for the question.
3. The atomic number of niobium (Nb) is 41. What's the electron configuration for Nb?
O A. [Ar] 3s 4p?
O B. [Kr] 5s? 5p
O C. [Kr] 4d45s
O D. (Ne) 4d
Answers: 1
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Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange
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Cryolite, na3alf6(s), an ore used in the production of aluminum, can be synthesized using aluminum oxide. start this question by first balance the chemical equation.1.) balance the equation: - alo3(s)+naoh(l)+hf(> na3alf6+h2o(g). 2.) if 17.5 kilograms of al2o3(s), 51.4 kilograms of naoh(l), and 51.4 kilograms of hf(g) react completely, how many kilograms of cryolite will be produced? 3.)which reactants will be in excess, (al2o3, naoh, or hf) 4.)what is the total mass of the excess reactants left over after the reaction is complete in kg?
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