What are atoms of the same elemnt with a different number of neutrons called?

What determines the average kinetic energy of the particles in a gas? a. the number of collisions b. the number of particles c. the size of the particles d. the temperature

Which of the following is not one of the steps in the scientific method a. hypothesize b. summarize c. analyze d. familiarize

20 pts ‼️ an unmanned spacecraft travels to mars. mars has a lower strength of gravity than earth. where in the image is the spacecraft’s weight the greatest?