Which solution containing one mole per dm 3 of the compound will have the lowest pH? A. Ethanoic acid B. Hydrochloric acid C. Sodium chloride D. Sodium hydrogen carbonate

I'm learning about the periodic tables and what each subject's configuration is. for example, hydrogen is 1s^1, but i don't understand how you get that. can someone me understand how to figure out how to figure this out? sorry if the question makes no sense, but it would really a lot if you could me understand! you so much if you can!

Can anyone explain 1. review your spectrometry data and use the known elements to identify the star's composition. which unknown elements make up this star? justify your element selections. 2. in parts i and ii of the lab, what happened to the electrons of each element to produce the different colors of light? explain your answers using important terms from the lesson and information provided in the laboratory. 3. stars composed of heavier (more massive) elements are often slightly older than stars made predominantly from hydrogen and helium. based on your data, is the newly discovered star a younger star? explain your answer.

20 !! 1 a metal has higher reactivity than magnesium. which of the following statements about the location of this metal on the periodic table can be true? a. the metal is to the right of magnesium in the same row. b. the metal is to the left of magnesium in the same row. c. the metal is below magnesium in the same column. d. the metal is above magnesium in the same column.