During all chemical reactions, charge, mass and energy are (A) Condensed
(B) Conserved
(C) Decayed
(D) Decomposed

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!

An alpha particle is: a hydrogen atom a nucleus of helium two neutrons an electron

If you try to move a piano and are unable to move it, did you perform any work in the scientific sense of the word? yes no correct anwser get brainliest