Question

atom a

1. how many protons are in atom a?
2. how many neutrons are in atom a?
3. how many electrons are in atom a?
4. what is the atomic mass of atom a?
5. what is the atomic number of atom a?

atom b
atom b?
atom b?
atom b?
atom b?
atom b?
7.

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

a. 26 electrons, 29 neutrons, 26 protons
b. 53 protons, 74 neutrons
c. 2 electrons (neutral atom)
d. 20 protons
e. 86 electrons, 125 neutrons, 82 protons (ion)
f. 0 neutrons
9.

Explanation:

Step1: Recall atomic structure facts

In a neutral atom, number of electrons = number of protons. Atomic number = number of protons. Atomic mass = number of protons + number of neutrons.

Step2: Answer for atom - related questions (general rules)

For an atom, we count the relevant particles from the structure or use given data.

Step3: Identify elements from particle - count

We use the periodic table. The atomic number (number of protons) determines the element.

For question 8a:

Number of protons = 26. Looking at the periodic table, the element with atomic number 26 is Iron (Fe).

For question 8b:

Number of protons = 53. The element with atomic number 53 is Iodine (I).

For question 8c:

In a neutral atom, number of electrons = number of protons = 2. The element with atomic number 2 is Helium (He).

For question 8d:

Number of protons = 20. The element with atomic number 20 is Calcium (Ca).

For question 8e:

Number of protons = 82. The element with atomic number 82 is Lead (Pb). Here, the ion has a different number of electrons due to charge, but the element is identified by protons.

For question 8f:

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

Since we can't see the details of Atom A and Atom B clearly in the image to answer questions 1 - 5 about them, we focus on question 8.

Answer:

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