The identity of an element depends on the number of 1. protons in the atom. 2.electrons in the atom. 3.neutrons in the atom. 4.protons and neutrons in the nucleus.

On mars a rock falls an unknown vertical distance from a resting position and lands in a crater. if it takes the rock 2.5 seconds to fall, how high is the cliff the rock fell from? mars' surface gravity is 3.8 m/s2. a. 9.5 m b. 11.9 m c. 15.2 m d. 23.8 m