Question

determine what element matches the following numbers of particles given below.

26 electrons,
29 neutrons,
26 protons

53 protons,
74 neutrons

2 electrons (in a neutral atom)

20 protons

Explanation:

1. For a neutral atom, the number of protons equals the atomic number, which defines the element. The number of neutrons gives the isotope, but the element is identified by protons.
2. For the first set: 26 protons = atomic number 26, which is Iron (Fe).
3. For the second set: 53 protons = atomic number 53, which is Iodine (I).
4. For the third set: 2 electrons in a neutral atom means 2 protons, atomic number 2, which is Helium (He).
5. For the fourth set: 20 protons = atomic number 20, which is Calcium (Ca).

Answer:

• 26 electrons, 29 neutrons, 26 protons: Iron (Fe)
• 53 protons, 74 neutrons: Iodine (I)
• 2 electrons (in a neutral atom): Helium (He)
• 20 protons: Calcium (Ca)