Imagine a kid sitting in a soap box. The moment it tosses a stone away to the left, the soap box, along with the kid, moves to the right. If the kid pushes against the stone with a force of 20 N in the moment of the toss, what will be the acceleration of the system kid+soap box? The kid's mass is 50 kg and the soap box's 10 kg.

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

d: the voltage of the secondary coil is less than that of the primary coil.

im not suree sorry if wrong

the answer is na (sodium)

confused

confused             hewdejdnjnjsnd