Which element has the same number of valence electrons as a krypton

How would doubling the made of an object change the objects potential energy

This is important. 1. which of the following is an si base unit for measuring length? (2 points) inch gram meter mole 2. which of the following units for distance is an si unit? (2 points) centimeter foot inch yard 3. which of the following tools should a scientist use to measure an object in meters? (2 points) electronic balance pan balance tape measure thermometer

What is the orbital period of a spacecraft in a low orbit near the surface of mars? the radius of mars is 3.4×106m.