Describe the structure of atoms, including the masses, electrical charges, and locations, of protons and neutrons in the nucleus and electrons in the electron cloud;
Track each student's skills and progress in your Mastery dashboards
Give this quiz to my class
Q 1/10
Score 0
Which of the following best describes an electron?
60
It has a positive charge and much more mass than a neutron.
It has a negative charge and about the same mass as a neutron.
It has a negative charge and much less mass than a proton.
It has no charge and about the same mass as a proton.
Q 2/10
Score 0
An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the atom’s nucleus?
60
30
−25
25
−30
10 questions
Q.
Which of the following best describes an electron?
1
60 sec
8.5a
Q.
An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the atom’s nucleus?
2
60 sec
8.5a
Q.
An atom of a certain element has 36 protons, 36 electrons, and a mass number of 84. At room temperature this element is a very stable gas. How many neutrons are in this atom? Be sure to use the correct place value.
3
60 sec
8.5a
Q.
In the early 1900s many scientists thought that an atom consisted of a positive substance with negative charges scattered throughout the substance. Then Ernest Rutherford completed an experiment that changed the concept of an atom. His discovery led to the understanding that an atom consists mostly of empty space with —
4
60 sec
8.5a
Q.
Which statement correctly describes the location and charge of the electrons in an atom?
5
60 sec
8.5a
Q.
What is the total number of protons, neutrons, and electrons in a cadmium, Cd, atom that has a mass number of 112? Be sure to use the correct place value.
6
60 sec
8.5a
Q.
A model of a beryllium atom is shown below. What types of particles are found in the cloud surrounding the atom’s nucleus?
7
60 sec
8.5a
Q.
What is the mass number of a potassium (K) atom that has 20 neutrons?
8
60 sec
8.5a
Q.
What is the difference between the number of electrons in an atom of selenium, Se, and the number of electrons in an atom of aluminum, Al? Be sure to use the correct place value.
9
60 sec
8.5a
Q.
How many protons, neutrons, and electrons are present in an atom of hafnium, Hf, with a mass number of 178?
