What is the correct formula of nickel (ii) oxide

What does earth’s rotation on its axis cause? the tides night and day passing of years phases of the moon

Which real-world scenarios below represent physical and chemical changes? -running a car -exploding fireworks -mixing water and powdered drink mix -combining oil and vinegar to make salad dressing -taking aspirin for a headache -diluting bleach with water-digesting dinner-spreading peanut butter on bread

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