HEL What does the number of valence electrons tell you about the reactivity of the element?

a) If an element has 1 or 7 valence electrons, then it is the most reactive.
b) If an element has 2 or 8 valence electrons, then it is the most reactive.
c) If an element has no valence electrons, then it is the most reactive.
d) There is no connection between valence electrons and reactivity

The diagrams show objects’ gravitational pull toward each other. which statement describes the relationship between diagram x and y? gravity attracts only larger objects toward one another. gravity attracts larger objects only if they are close to one another. if the masses of the objects increase, then the force between them also increases. if distance between the objects increases, then the amount of force also increases.

Joan writes four numbers on the board in standard form, and then she writes their scientific notation

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.