Which of the following is NOT an example of a chemical change? a. Mixing baking soda and vinegar together causing bubbles and foam.
b. A glass cup falling to the floor and breaking.
c. Lighting a piece of paper on fire.
d. Baking a birthday cake.

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

Write a brief passage describing a neutral atom of nitrogen-14 (n-14). describe the number of protons, neutrons, and electrons in the atom, where each type of particle is located, and how the terms atomic number, mass number, and atomic mass are related to the particles. use the periodic table to you. 14 protons and eletrons since its a neutral atom

How are isotopes of the same chemical element alike? how are they different?