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Worksheets2024-25 RHS Chemistry Review Part 2of4 TEKS 6B
Total questions: 20
Worksheet time: 12mins
Neutrons have (a) charge and are located (b) . Electrons have (c) charge and are located (d) .
Which statement BEST compares the atoms of two elements that have similar chemical properties?
The atoms of both elements have the same number of neutrons.
The atoms of both elements have the same number of valence electrons.
The atoms of both elements have an equal number of energy levels.
The atoms of both elements have an even number of positive and negative charges.
A neutral atom has an atomic mass of 16 amu. Which particles contribute the MOST to the atomic mass of this atom?
Protons and electrons
Protons and neutrons
Neutrons and electrons
Protons only
A neutral atom of which element has 12 protons?
Carbon (C)
Chromium (Cr)
Magnesium (Mg)
Zinc (Zn)
Which of these statements about the mass of subatomic particles is true?
The mass of a proton is the same as the mass of an electron.
The mass of a neutron is the same as the mass of an electron.
The mass of a neutron is much greater than the mass of a proton.
The mass of a proton is much greater than the mass of an electron.
Which table correctly identifies the charges of subatomic particles?
Table 1: Proton (+), Neutron (0), Electron (-)
Table 2: Proton (0), Neutron (+), Electron (-)
Table 3: Proton (-), Neutron (0), Electron (+)
Table 4: Proton (+), Neutron (-), Electron (0)
The diagram shows a model of an atom. The model contains three different subatomic particles. Particles X and Y are inside the nucleus, and particle Z is outside of the nucleus. Which statements best describe the charges on the particles in this model?
A. Both particles X and Y have a positive charge. Particle Z has a negative charge.
B. Both particles X and Y have a negative charge. Particle Z has a positive charge.
C. Either particle X or particle Y has a positive charge.
If a fluorine atom has a mass number of 19, how many neutrons are in the atom?
8
9
10
11
An atom of lead (Pb) having an atomic mass of 207 amu has an atomic number of 82. How many neutrons are present in this atom of lead?
125
82
207
289
How many neutrons are in the nucleus of a potassium atom with a mass number of 39?
20
18
21
19
Which statement accurately describes the atoms of a specific element?
An indium, In, atom contains 115 protons inside the nucleus and 49 neutrons outside the nucleus.
A scandium, Sc, atom contains 45 electrons outside the nucleus and 21 neutrons inside the nucleus.
An aluminum, Al, atom contains 27 electrons and 27 protons inside the nucleus.
A zinc, Zn, atom contains 30 protons inside the nucleus and 30 electrons outside the nucleus.
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?
21
12
25
8
How many protons, neutrons, and electrons are present in an atom of hafnium, Hf, with a mass number of 178?
72 protons, 178 neutrons, 106 electrons
72 protons, 106 neutrons, 72 electrons
178 protons, 250 neutrons, 72 electrons
106 protons, 72 neutrons, 106 electrons
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 —
protons orbiting a dense nucleus made of electrons and neutrons
electrons orbiting a dense nucleus made of protons and neutrons
neutrons and protons orbiting a cloud of electrons
electrons and protons orbiting a cloud of neutrons
What types of particles are found in the cloud surrounding the atom’s nucleus?
Positively charged particles and negatively charged particles
Negatively charged particles only
Neutral particles and positively charged particles
What is the mass number of a potassium (K) atom that has 20 neutrons?
18
19
20
39
Which of the following best describes an electron?
It has no charge and about the same mass as a proton.
It has a negative charge and much less mass than a proton.
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.
An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the atom’s nucleus?
+25
+30
Which of these best describes one of the subatomic particles that could be found at location X in the model of an atom shown above?
It has mass but no charge.
It has no mass and a positive charge.
It has a large mass and a negative charge.
It has no mass and an equal number of positive and negative charges.
Label the following subatomic particles.
Proton
Neutron
Electron
Positron
