Can you me the question says

a student has a rectangular block. it is 2 cm wide, 3 cm tall and 25 cm long. it has a mass of 600 g . first calculate the volume of the block:

The volume is L x W x H

25 x 2 x 3 = 150 cm cubed 

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom

Well technically there are two correct answers b and d. but for you its probably b in general.good day sir/ma'am : ) (i know not gender)