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You're correct. There is 2.1g H. Also, there is 65.3g O and 32.6g S.

2.)a)Cl b)Ne c)K d)Mn 3.)proton, neutron, electron 4.)a)8 b)29 c)79 5.)a)4 b)12 c)8 6.)left side of table, mostly silver, often ductile 7.)Yes, they both contain the same cation 8.)Dependant variables go on the y-axis 9.)There was a solid core(nucleus) that caused the alpha particles to repel...