Which of the following measurements of different masses is most precise ?
a. 6.2000 g
b. 6. g
c. 6.24400 g
d. 6.2 g

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?

1. explain hydrogen peroxide, h 2 o 2 properties and decomposition reaction. 2. describe how each of the following natural cycles plays a part in earth’s climate system. (a) the water cycle (b) the carbon cycle

The equation picture below shows which type of nuclear reaction u 235 + n x e 134 + sr 100 + 2n