An element X(atomic number 20) reacts and an element Y (atomic number 17).i. Where in the periodic table are elements X and Y placed?ii. Identify X & Y. iii. Classify X and Y as metal (s) &non-metal(s) iv. What will be the nature of the oxide of element X(acidic / basic)?v. What will be the formula of the compound formed between them

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?

Choose all the answers that apply. fluorine (f) has an atomic number of 9 and an atomic weight of 18.99. fluorine has a. 9 protons b. 10 neutrons c. 18 electrons d. an atomic mass of 19 e. at least one isotope

What is the measured amount of a product obtained from a chemical reaction?