Which of the following elements will form positive ions? Check all that apply.
Na
N
Cu
Br

Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?

Define a is a tiny pavket of energy

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)