What common characteristic is generally shared by the elements at the center of a period?
a. they are nonmetals.
b. they have the lowest atomic mass.
c. they are the least reactive elements.
d. they have the most orbitals.

What pressure will be exerted by 0.675 moles of a gas at 25*c if it is in a 0.750-l container?

According to the tide table below what time of day will the highest tide occur?

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.