Develop and use models to compare and contrast the structure of atoms, ions and isotopes. (Clarification statement: Properties include atomic number, atomic mass and the location and charge of subatomic particles.)
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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
SPS1a
Q.
An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the atom’s nucleus?
2
60 sec
SPS1a
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
SPS1a
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
SPS1a
Q.
Which statement correctly describes the location and charge of the electrons in an atom?
5
60 sec
SPS1a
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
SPS1a
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
SPS1a
Q.
What is the mass number of a potassium (K) atom that has 20 neutrons?
8
60 sec
SPS1a
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
SPS1a
Q.
How many protons, neutrons, and electrons are present in an atom of hafnium, Hf, with a mass number of 178?
