What happens to the electronegativity of elements as you move from bottom left to upper right across the periodic table?

Energy flows from the producer level to the level. is called

Assume you measured the mass of the cart to be (500 ± 1) g and the mass of the additional mass you put on the cart to be (500 ± 1) g as well. since the scale you are using in the lab cannot measure objects heavier than 600g you will have to sum up individual pieces and propagate the error. so what would be the mass and the standard error of the cart and the mass

How to calculate voltage drop in a series circuit