Which of the three kinds of radiation is dangerous to us and why?

Which of the following is not true about the atomic model of substances?

What is the morality of 2.50 l of solution that contains 1.85 mol of anhydrous sodium tetraborate?

How long could you survive without electricity? what parts of your life would be affected by loss of electricity? should you prepare for an electricity outage, and if so, how would you prepare? what backup system could your family or community install to generate limited amounts of electricity during an outage? how does this system create an electric force field and generate electric current?