What exactly is atomic number and atomic mass? dont plagarize pls

Atomic Number and Mass Number definition

Atomic number and mass number are numbers that always remain whole because they are obtained by counting whole numbers (protons, neutrons, and electrons). When you sum up the numbers of the mass number and the atomic number for an atom (A-Z) it will correspond to the total number of subatomic particles present in the atom. They are forms of the same atom that differ only in their number of neutrons are called isotopes. When you sum them up, the number of protons and the number of neutrons will determine an element's mass number: mass number = protons + neutrons.

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Explanation:

The atomic number of an atom is the number of protons that it has, or the number you see on the periodic table next to the name of the element. The number of protons in an atom determines all of the rest of its properties. The atomic mass is the combination of the weight of the neutrons and protons, averaged out across the weights of all the isotopes based on their frequency (some atoms have more or less neutrons, which changes that weight). Hope this helps!

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2