An atom has 143 neutrons, 92 protons, and 91 electrons. what element is it?

Whats an electronegativity?

Identify one advantage to each of the following models of electron configuration: Dot structures Arrow and line diagrams Written electron configurations

Calculate the number of grams of Mg needed for this reaction to release enough energy to increase the temperature of 78 mL of water from 29 ∘C to 78 ∘C.

Which of these are examples of chemical changes? Check all that apply. burning a candle boiling alcohol frying an egg melting an ice cube making coffee

A catalyst is used to increase the reaction rate of a chemical reaction. a catalyst achieves this by A. increasing the activation energy. B. decreasing the kinetic energy. C. decreasing the activation energy. D. increasing the kinetic energy.

Which describes the polarity in a water molecule? a). partial negative charge on the oxygen atom because its electrons are pulled toward the hydrogen atoms b).

To what temperature in kelvin will a 2.3 L balloon have to be heated to expand to a volume of 400 L Assume the initial temperature of the balloon is 25 degrees celsius.

In which changes of state do atoms lose energy?

Can you live without body tissue? This is a yes or no question, no explaining required, but you can add it if you want. : D

According to the graph, which activity has used the largest amount of water over the past twenty years?