Determine the number of protons, number of neutrons in the nucleus: He2 3

He2 4

Mg12 24

Na1123

Ti2248

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?

What is the main reason why some developing countries fear the increase the free trade policies around the world?

Read the chemical equation. 2c2h2 + 5o2 → 4co2 + 2h2o which of the following statements would be correct if one mole of c2h2 was used in this reaction? one mole of oxygen was used in this reaction. five moles of oxygen were used in this reaction. four moles of carbon dioxide were produced from this reaction. two moles of carbon dioxide were produced from this reaction.