Question

1. name the element which has the following numbers of particles:

a. 26 electrons, 29 neutrons, 26 protons
b. 53 protons, 74 neutrons
c. 2 electrons (neutral atoms)
d. 20 protons
e. 86 electrons, 125 neutrons, 82 protons
f. 0 neutrons

Explanation:

Step1: Recall element - identity rule

The atomic number (Z) of an element is equal to the number of protons in a neutral atom. Each element has a unique atomic number.

Step2: Identify element for part a

Since the number of protons is 26, looking at the periodic - table, the element with atomic number 26 is iron (Fe).

Step3: Identify element for part b

With 53 protons, the element is iodine (I) as its atomic number is 53.

Step4: Identify element for part c

For a neutral atom with 2 electrons, it has 2 protons, and the element is helium (He).

Step5: Identify element for part d

An element with 20 protons is calcium (Ca).

Step6: Identify element for part e

The number of protons determines the element. With 82 protons, the element is lead (Pb).

Step7: Identify element for part f

The only element with 0 neutrons is hydrogen (H).

Answer:

a. Iron (Fe)
b. Iodine (I)
c. Helium (He)
d. Calcium (Ca)
e. Lead (Pb)
f. Hydrogen (H)