Javier made a list about balanced and unbalanced forces: Balanced Forces can cause an object to speed up, slow down, or change directions.
Unbalanced Forces cause objects to stay in the same place or to continue moving at the same speed.
Javier made a mistake on his list whichbest describes the mistake Javier made?
А Javier forgot to add that forces can never change.
B. Balanced forces only cause objects to change directions.
C Unbalanced forces only cause objects to stay in the same place.
D Javier switched the descriptions for unbalanced and balanced forces.

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.

the awnser is group 12