Q44P - Chemistry: Molecular Nature Of Matter And Change

Question

Write the ${}_{\mathbf{Z}}{}^{\mathbf{A}}\mathit{X}$ notation for each atomic depiction:

(a)(b)(c)

Step-by-Step Solution

Answer

$\begin{array}{l}\left(a\right) {}_6{}^{13}C\\ \left(b\right) {}_{40}{}^{90}Zr\\ \left(c\right) {}_{28}{}^{61}Ni\end{array}$

Step 1 Solution for part (a)

Given, 

Number of protons = 6

Number of electrons = 6 

Number of neutrons = 7

We know, 

Atomic number = number of protons = 6

Atomic mass = number of protons + number of neutrons 

Atomic mass = 6 + 7 = 13

From the above calculation,$\begin{array}{l} {}_6{}^{13}C\end{array}$

Step 2 Solution for part (b)

Given, 

Number of protons = 40

Number of electrons = 40

Number of neutrons = 50

We know, 

Atomic number = number of protons = 40

Atomic mass = number of protons + number of neutrons 

Atomic mass = 40 + 50 = 90 

From the above calculation, $\begin{array}{l}\\ {}_{40}{}^{90}Zr\\ \end{array}$

Step 3 Solution for part (c)

Given, 

Number of protons = 28

Number of electrons = 28 

Number of neutrons = 33

We know, 

Atomic number = number of protons = 28

Atomic mass = number of protons + number of neutrons 

Atomic mass = 28 + 33 = 61

From the above calculation, $\begin{array}{l} {}_{28}{}^{61}Ni\end{array}$