Chemistry and System charging

What's the answer of 1 ,2,3
Subject
Level
Highschool
Grade
10
Please answer those questions for me ASAP
Subject
Level
Highschool
Grade
10
37 +34-78+56-67
Subject
Topic
Level
Primary
Grade
13
What is the answer to h and i
Subject
Level
Highschool
Grade
10
What are nuclides?
Subject
Level
Highschool
Grade
10
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