A neutral isotope of an element contains 21 electrons and 24 neutrons.What is the following representation for this nucleus?

Question

Quizplus · Accepted Answer

The representation of an isotope includes the atomic number (number of protons) and the mass number (number of protons and neutrons). The atomic number is 11 because the element is neutral (meaning it has an equal number of protons and electrons), and it contains 21 electrons. The mass number is 24 because there are 24 total particles in the nucleus (21 electrons + 24 neutrons = 45 total particles; 45 - 21 electrons = 24 neutrons). Therefore, the correct representation is:

11ea7fdf_ad87_6ee8_99dd_5ffe15c1ab26_TB2243_11

A Neutral Isotope of an Element Contains 21 Electrons and 24