Who created a model of the atom with electrons moving around the nucleus in fixed orbits?

What is the charge on a hypothetical ion with 35 protons and 33 electrons?

While wearing rubber-soled shoes, you rub a helium balloon on your sweater. The balloon becomes negative charged. Now release the balloon. When the balloon is at the ceiling, you are A) negatively charged. B) electrically neutral.

In a series circuit with three bulbs, adding another bulb will do what?

Byron wanted to try out different watercraft. He went 124 miles downstream in a motorboat and 45 miles downstream on a jet ski. His speed on the jet ski was 10 mph faster than in the motorboat. Byron spent a total of 4 hours on the water.

A 50 g ball of clay traveling at speed v0 hits and sticks to a 1.0 kg block sitting at rest on a frictionless surface. part a what is the speed of the block after the collision?

A child pushes horizontally on a box of mass m which moves with constant speed v across a horizontal floor. The coefficient of friction between the box and the floor is μ. At what rate does the child do work on the box?

What two qauntities must be known to calculate the density of a sample of matter

An element's atomic number is 38. How many protons would an atom of this element have?

What's are some forms of chemical energy

True or false a liquid does not have a definite shape, but it does have a definite volume.