Consider two atoms 50/21K and 58/21L FL. Which statement decribes these atoms

These are atoms of the same element.
b. These are isotopes of the same element.
These are atoms of different elements.
d. These atoms have the same number of neutrons in their nuclei.

< > according to newton's third law of motion, forces always act in equal but opposite pairs. another way of saying this is for every action, there is an equal but opposite reaction.< >

hcl + naoh → h2o + nacl

explanation:

hcl + naoh → h2o + nacl   is the reaction that is correctly balanced.

however, pcl3 + h2 → ph3 +3hcl, 2ca+ 3cl2 → cacl3, and c5h12 + 5o2 → 5co2 + 6h2o are not correctly balanced.