Complete the sentence indicating the number of protons and electrons in the given ion. Match the numbers to appropriate blanks in the sentences. The ion O has 7 protons and 8 electrons 9 10 11 16 17 18 What isotope has 14 protons and 15 neutrons? Enter the name of the element followed by a hyphen and the mass number (e. g., uranium- 23 4). Which element does X represent in the following expression: 2X? Enter the chemical symbol of the element.

How does a catalyst increase the speed of a reaction? a. the catalyst eliminates the activated complex stage, allowing products to form immediately. b. the catalyst lowers the energy level of the reactants, making it easier for them to react. c. the catalyst makes it easier for the activated complex to form, lowering the activation energy. d. the catalyst raises the energy level of the products, making the reaction finish sooner. reset next