Please answer all of the questions 1. What are the three types of particles, and their charge, that can be found in an atom?
2. Why does every element except hydrogen need at least one neutron in its nucleus?
3. The atomic number of carbon is 6 and the atomic number of nitrogen is 7. How do the number of neutrons and protons in the nuclei of carbon-14 and nitrogen-14 differ?
4. What is the atomic mass of gallium, which occurs naturally as 60% gallium-69 and 40% gallium-71? Show you work.

A50.0-n box is sliding on a rough horizontal floor, and the only horizontal force acting on it is friction. you observe that at one instant the box is sliding to the right at and that it stops in 2.25 s with uniform acceleration. what magnitude force does friction exert on this box

Two thin 80.0- cm rods are oriented at right angles to each other. each rod has one end at the origin of the coordinates, and one of them extends along the x- axis while the other extends along the yaxis. the rod along the x- axis carries a charge of - 15.0 μ c distributed uniformly along its length, and the other rod carries 15.0 μ c uniformly over its length. find the magnitude and direction of the net electrical force that these two rods exert on an electron located at the point (40.0 cm, 40.0 cm). (e

An atom that has gained or lost electrons is called an _