Which atoms have the same number of neutrons?

1) H-1 and He-3

2) H-2 and He-3

3) H-3 and He-3

4) H-3 and He-4

Darwin observed a variety of tortoises on the Galapagos Islands. These observations provided evidence for which of these statements?

What are ways to make a reaction go faster

What is the plant use for carbon

There are eight protons in an oxygen atom and one proton in a hydrogen atom. What are these number called? A: periodic table B: mass number C: atomic number

Why does ice float? a. of cohesion. b. ice has a higher density than water. c. water shrinks when it freezes. d. water expands when it freezes.

Which of the following will most likely happen if you apply unbalanced forces to an object? It will change position. It will become charged. It will change mass. It will change size.

Magnetism easily separates what mixture? A). Sand and glass B). Sand and iron C). Sand and clay D). Sand and aluminum

Match the science with the best description?

Can magnetism be used to identify a substance

Nitrogen dioxide dimerizes to give dinitrogen tetroxide: 2NO2 (g) → N2O4 (g). At 298 K, 12.55 g of an NO2/N2O4 mixture exerts a pressure of 0.963 atm in a volume of 6.92 L. What are the mole fractions of the two gases in the mixture?