this is my physical science homework on chemical equations please if you can answer them in order thank you!

Fill in the blank. the number of each type of element in the compound (other than 1) is represented by a small number to the right of the element symbol.

Determine el momento angular de un rueda de 3000g moviendose a 10m/s con un radio de giro de 400cm

What do elements in a family tend to share. a.) similar periods b.) similar groups c.) similar atomic symbols d.) similar chemical properties and characteristics