Owhich two elements will be the most alike and why? a. helium (he) and hydrogen (h) b. oxygen (o) and neon (ne) c. lithium (li) and sodium (na)

This is the substance(s) formed in a chemical reaction.

Avolcano erupts next to a grassland area in a valley. a. describe three ways in which material released by the volcano could impact the grassland area. b. describe three ways in which the grassland ecosystem could recover after a volcanic eruption.

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples