How many valence electrons would an element with atomic number 84 have

Which of these is an example of a scientific theory? A. "We saw a raccoon last night." B. "I think I left my notebook in science class." C. "The blue whale is the largest type of whale." D. "The farther away a galaxy is, the faster it is moving."

Why is newton's first law of motion sometimes called the lae of inertia?

What type of earth science would study the ways of predicting earthquakes? Explain you're answer.

What is the weight of a 30.0 kg object?

Two charged particles are located on the x axis. The first is a charge 1Q at x 5 2a. The second is an unknown charge located at x 5 13a. The net electric field these charges produce at the origin has a magnitude of 2keQ / a2.

Why is it easier to read black text on a white background than to read green text of any light color?

If object A has more mass than object B, does object A contain more matter? Explain.

Describe a beach that was near stormy seas and powerful waves

We all depend on electricity. Most electricity is created by electromagnetic generators at large power plants and distributed through an electric grid.

A rock with mass m = 4.00 kg falls from rest in a viscous medium. The rock is acted on by a net constant downward force of F = 17.