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Determine the number of protons, neutrons, and electrons in a particular atom. Objectives:

1.Differentiate atoms from molecules.
2. Discuss the historical background of the atom and its sub-atomic particles and explain its relevance in the development of the atomic model.
3. Describe the atom and its sub-atomic particles.
4. Determine the number of electrons, protons, and neutrons in an atom.
5. Define isotopes and give examples and their uses.
6. Determine the number of protons, neutrons, and electrons in the different isotopes of an element.​

Sagot :

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Answer:

1. Atom refers to the smallest constituent unit of a chemical element. Molecules refer to a group of two or more atoms that are held together due to chemical bonds.

2. Matter is composed of indivisible building blocks. This idea was recorded as early as the fifth century BCE by Leucippus and Democritus.

3. There are three subatomic particles: protons, neutrons and electrons. Two of the subatomic particles have electrical charges: protons have a positive charge while electrons have a negative charge. Neutrons, on the other hand, don't have a charge.

4. To calculate the numbers of subatomic particles in an atom, use its atomic number and mass number: number of protons = atomic number. number of electrons = atomic number.

5. Isotope → Isotopes are atoms with the same number of protons, but differ in numbers of neutrons. Isotopes are different forms of a single element. Example - Carbon 12 and Carbon 14 are both isotopes of carbon, one with 6 neutrons and one with 8 neutrons.

6. To find the number of neutrons in an isotope, subtract the number of protons from the atomic mass of the isotope. The atomic number of the element equals the number of protons.

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