Which subatomic particle determines the identity of the element?

Protons

Explanation:

There are three major sub-automatic particles to consider here

1) Proton

2) Electrons

3) Nucleons

Two atom with same protons and electrons but different nucleons are called isotopes of the same element, hence the nucleon doesn't affect the identity of an element

Two atoms with same proton and nucleon but different electrons are usually a stable atom and an ion, both of the same elements, hence election number does not define the identity of the element

Two atoms with different proton numbers, no matter the electron and nucleon number will always be different elements

a charge 3q is at the origin, and a charge −2q is on the positive x axis at x=a. part a where on the x-axis would you place a third charge so it would experience no net electric force? enter an expression for the exact answer, which will involve a square-root sign. (do not enter an approximate decimal answer.)

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s