Fill in the gaps in the following table, assuming each column represents a neutral atom. Symbol 79 Br Protons 25 82 Neutrons 30 64 Electrons 48 86 Mass no. 222 207 Complete the fifth row of the table.

Hi everyone here we have a question asking us to consider the following table showing symbols, the number of protons, electrons and neutrons and the mass number. Each column represents a neutral atom and our goal is to fill in the third column of this table. So one key aspect here is that it represents a neutral atom, which means the number of electrons is going to equal the number of protons. So we know we have 50 electrons, which means we will also have 50 protons. And our protons is the same as our atomic number. So if we look on the periodic table for the atomic number 50, we see that it is 10. And to find the mass number, the mass number equals the number of protons plus the number of neutrons, Which in this case is plus 50 Which equals 118. So our mass number is 118 And we will have a 118 above the 10 symbol. So that is our final answer. Thank you for watching. Bye.

Ch.2 - Atoms, Molecules, and Ions

All textbooks

Brown 14th Edition

Ch.2 - Atoms, Molecules, and Ions

Problem 29e

Chapter 2, Problem 29e

Fill in the gaps in the following table, assuming each column represents a neutral atom.
Symbol ⁷⁹Br
Protons 25 82
Neutrons 30 64
Electrons 48 86
Mass no. 222 207

Complete the fifth row of the table.

Verified step by step guidance

Identify the missing information for the fifth row: the symbol, protons, neutrons, electrons, and mass number.

Use the given mass number (207) and the number of neutrons (64) to find the number of protons: Mass number = Protons + Neutrons, so Protons = Mass number - Neutrons.

Since the atom is neutral, the number of electrons equals the number of protons.

Use the number of protons to determine the element's symbol by referring to the periodic table.

Fill in the missing information in the table: symbol, protons, neutrons, electrons, and mass number.

Verified video answer for a similar problem:

This video solution was recommended by our tutors as helpful for the problem above.

Video duration:

Was this helpful?

Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Atomic Structure

Atoms consist of protons, neutrons, and electrons. Protons are positively charged particles found in the nucleus, while neutrons are neutral particles also located in the nucleus. Electrons are negatively charged and orbit the nucleus. The number of protons defines the element, while the total number of protons and neutrons gives the atomic mass.

Isotopes

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons. This results in different atomic masses for the isotopes. For example, bromine-79 (79Br) has 35 protons and 44 neutrons, while another isotope may have a different neutron count, affecting its mass number.

Mass Number

The mass number of an atom is the sum of its protons and neutrons. It is a whole number that represents the total mass of the nucleus. In the context of the table, filling in the mass number requires adding the number of protons and neutrons for each atom, which helps in identifying the specific isotope and its properties.

Recommended video:

Guided course