Which part of the atom determines the chemical properties and chemical reactivity of an element? A. The number of valence electrons
B. The total number of electrons
C. The number of neutrons
D. The number of protons

According to social exchange theory, altruistic behaviors benefit the individual who performs them.

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds

An electron is ejected into a horizontal uniform e⃗ field at a parallel horizontal velocity of v0. assume the electron's initial position x0, initial velocity v0, time t, magnitude of electric field e, electron's mass m, and the magnitude of the electron's charge |e|. ignore the force that earth exerts on the electron. assume the e⃗ field is in the same direction as the initial velocity. part a define the equation for the electron's velocity. express your answer in terms of the variables v0, |e|, t, e, and m.