If 100 atoms of element Y contain 60 atoms of 9Y and 40 atoms of 11Y, calculate the relative atomic mass (one decimal place) of Y.​

Which metal exist in liquid state and can be cut with knife ?

You have a liquid that exhibits diltancy. you want to pour it from a bottle. what should you do to the bottle before pouring

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!