Which statement is true about the atomic mass? a. it is never greater than the atomic number b. it always equal the atomic number c. it always lowers the atomic number d. it can be greater than the atomic number

d. it can be greater than the atomic number          

Explanation:

Atomic mass number can be defined as the sum of number of protons and number of neutrons present in the nucleus of an atom. On the other hand, atomic number is determined by the number of protons present in the nucleus of the atom. Thus, atomic mass number can be equal or greater than the atomic number but cannot be less than it. Hydrogen has 1 proton and 0 neutrons. So, atomic mass number and atomic number are equal. For rest, the atomic mass number is greater than the atomic number. Thus, option d is correct.

the total distance traveled by the car is

30km + 49km = 79 km .

as we know our atmosphere or air have different levels. every level has other gasses, and every gas has another permeability. when the light comes from lower permeability to higher permeability, it changes its direction. so that means that when the light comes from the moon to the earth, it changes it's direction many more times. it basically means that the shape of the light part of the moon is changed on the earth.

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