Students volunteering at a charity event work 1/2-hour shifts zack volunteered for 4 hours he incorrectly divided one half by four to find the number of shifts he worked how should zack have calculated the number of his shifts

An atom of sodium-23 (atomic number = 11) has a positive charge of +1. give this information, how many electrons does it have? how many proteins and neutrons does this atom have

What do electromagnetic waves carry? how are they produced through which media can they move? where do they transfer energy? what do they not transfer? what do mechanical waves carry? how are they produced? through which media can they move? where do they transfer energy? what do they not transfer?

What is the neutralization reaction