two elements X and Y have atomic no. 12 and 17 respectively. write the formula of the compound formed by their combination

Which of the following compounds does not contain molecules? question 2 options: co2 h2 nacl h2o

98 ! and brainliest plz ! the below reaction can be categorized as more than one type of reaction. which reactions are these, and what are the types of reactions?

Which statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.