Question

1. fill in the correct answer.

a. what element/ion can be represented by 56 f, 54 e, 56 p?
b. what element/ion can be represented by 7 y, 7 e, 7 p?
c. write the az x notation of a vanadium atom with 25 neutrons.
d. what is the atomic number of iron - 56?
e. what is the mass number of boron - 11?
f. how many protons are found in an atom of strontium?
g. how many protons are found in an atom of sulfur - 32?
h. how many electrons are found in an atom of mercury - 200?

Explanation:

Step1: Recall atomic number and mass - number concepts

The atomic number ($Z$) is the number of protons in an atom, and the mass - number ($A$) is the sum of protons and neutrons. The notation $_{Z}^{A}X$ represents an atom where $X$ is the chemical symbol, $Z$ is the atomic number, and $A$ is the mass - number.

Step2: Answer part a

The notation $_{16}^{34}X$: The atomic number $Z = 16$, which corresponds to sulfur (S). So the element is sulfur.

Step3: Answer part b

The notation $_{7}^{14}X$: The atomic number $Z = 7$, which corresponds to nitrogen (N). So the element is nitrogen.

Step4: Answer part c

Vanadium has an atomic number $Z=23$. If it has 25 neutrons, then the mass - number $A=Z +$ number of neutrons $=23 + 25=48$. The $AZX$ notation is $_{23}^{48}V$.

Step5: Answer part d

For iron - 56, the mass - number is 56. Iron has an atomic number $Z = 26$.

Step6: Answer part e

For boron - 11, the mass - number $A = 11$.

Step7: Answer part f

Strontium has an atomic number $Z = 38$. The number of protons in a strontium atom is 38.

Step8: Answer part g

Sulfur has an atomic number $Z = 16$. The number of protons in a sulfur - 32 atom is 16.

Step9: Answer part h

Mercury has an atomic number $Z = 80$. In a neutral atom, the number of electrons is equal to the number of protons. So, the number of electrons in a mercury - 200 atom is 80.

Answer:

a. Sulfur
b. Nitrogen
c. $_{23}^{48}V$
d. 26
e. 11
f. 38
g. 16
h. 80