NEED HELP ASAP WILL MARK BRAINLIEST Isotopes are .
Compounds
Atoms of the same element but with different mass
Atoms that have a charge
Atoms of different elements

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.

An astronaut on the moon throws a baseball upward. the astronaut is 6 ft, 6 in. tall, and the initial velocity of the ball is 3030 ft per sec. the height s of the ball in feet is given by the equation s equals negative 2.7 t squared plus 30 t plus 6.5s=−2.7t2+30t+6.5, where t is the number of seconds after the ball was thrown. complete parts a and b.