One isotope of a metallic element has the mass number 65 and 35 neutrons in the nucleus. the cation derived from the isotope has 28 electrons.

a. what is the symbol for the element?
b. what is the charge?

Select the word from the list that best fits the definition classification of most stars on the h-r diagram

Heena wants to measure the volume of a ball that is 24 cm across. how should she set up her equation?

Aball with a mass of 275 g is dropped from rest, hits the floor and rebounds upward. if the ball hits the floor with a speed of 2.40 m/s and rebounds with a speed of 1.70 m/s, determine the following. (a) magnitude of the change in the ball's momentum (let up be in the positive direction.)