The Structure of the Atom Assignment and Quiz
Carbon-12 and carbon-13 are isotopes of carbon. Which of the following statements is correct?
They both have the same atomic number.
Boron occurs naturally as two isotopes. What is the difference between these isotopes?
They have different numbers of neutrons and different mass numbers.
The diagram below is an artist's impression of a single atom of element Be. The neutrons are shown with stripes, the protons are gray, and the electrons are black. These particles are not drawn to scale. mc017-1.jpg Which element below could be an isotope of this atom?
beryllium-10
A particle that orbits the nucleus in an atom is called a(n)
electron
A scientist uses an accelerator and high energy electrons to study the particles inside the protons of a helium atom. What particles is the scientist studying?
the He quarks
An atom contains one proton, one electron, and one neutron. Which two particles are most similar in mass?
the proton and the neutron
What is the charge on an electron?
-1
A nitride ion has 7 protons, 8 neutrons, and 10 electrons. What is the overall charge on this ion?
-3
Boron has an average atomic mass of 10.81. One isotope of boron has a mass of 10.012938 and a relative abundance of 19.80 percent. The other isotope has a relative abundance of 80.20 percent. What is the mass of that isotope? Report to two decimal places.
11.01 amu
The table below gives the atomic mass and relative abundance values for the three isotopes of element M. What is the average atomic mass (in amu) of element M?
24.30
The mass number of Fe^2+ is 56. How many neutrons are there in a single Fe^2+ atom?
30
Using the information in the table to the right, calculate the average atomic mass of strontium. Report to two decimal places.
87.62 amu
An atom of sodium-23 (Na-23) has a net charge of +1. Identify the number of protons, neutrons, and electrons in the atom. Then, explain how you determined the number of each type of particle. Use the periodic table to help you.
It contains 11 protons in the nucleus. It contains 12 neutrons in the nucleus. It contains 10 electrons surrounding the nucleus. The number of electrons are calculated from net charge and charge of proton (+1) and electron (-1). 12 neutrons are calculated from atomic number: 11 and mass number: 23.
Write a brief passage describing a neutral atom of nitrogen-14 (N-14). Describe the number of protons, neutrons, and electrons in the atom, where each type of particle is located, and how the terms atomic number, mass number, and atomic mass are related to the particles. Use the periodic table to help you.
It contains seven protons in the nucleus. It contains seven neutrons in the nucleus. It contains seven electrons in orbitals around the nucleus. Its atomic number is its number of protons. Its atomic mass is the mass of protons and neutrons.
