Determine the number of protons,neutrons,and electrons in the following: $${ } _ { 18 } ^ { 40 } \mathrm { X }$$ A)p⁺ = 18 n° = 18 e^- = 22 B)p⁺ = 18 n° = 22 e^- = 18 C)p⁺ = 22 n° = 18 e^- = 18 D)p⁺ = 18 n° = 22 e^- = 40 E)p⁺ = 40 n° = 22 e^- = 18

Question

Quizplus · Accepted Answer

The atomic number, which is the number of protons in an atom, is 18 for this element as indicated by the subscript. The mass number, which is the sum of protons and neutrons, is 40 as indicated by the superscript. To determine the number of neutrons, we subtract the atomic number from the mass number: 
40 - 18 = 22 
Therefore, there are 18 protons, 22 neutrons, and 18 electrons in this element. Option B matches this answer.

Determine the Number of Protons,neutrons,and Electrons in the Following 1840X{ } _ { 18 } ^ { 40 } \mathrm { X }1840​X

Determine the Number of Protons,neutrons,and Electrons in the Following ${ } _ { 18 } ^ { 40 } \mathrm { X }$