Which of the following is a difficulty associated with environmental protection?
a. cost
b. unpredictability
sustainability
d. all of the above

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

What are several ways to reduce the effect of friction

What is the popular use of lithium batteries