WorksheetsAtomic Structure Test
Total questions: 18
Worksheet time: 2hrs 30mins
How many electrons does it take to equal the mass of one proton or neutron?
1/1840
1840
2000
1
All atoms are
positively charged, with the number of protons exceeding the number of electrons.
negatively charged, with the number of electrons exceeding the number of protons.
neutral, with the number of protons equaling the number of electrons.
neutral, with the number of protons equaling the number of electrons, which is equal to the number of neutrons.
The particles that are found in the nucleus of an atom are ____.
neutrons and electrons
electrons only
protons and neutrons
protons and electrons
The atomic number of an element is the total number of which particles in the nucleus?
neutrons
protons
electrons
protons and electrons
An element has an atomic number of 76. The number of protons and electrons in a neutral atom of the element are ____.
152 protons and 76 electrons
76 protons and 0 electrons
38 protons and 38 electrons
76 protons and 76 electrons
All atoms of the same element have the same ____.
number of neutrons
number of protons
mass numbers
mass
The sum of protons and neutrons in an atom equals the _____.
atomic number
nucleus number
atomic mass
mass number
If E is the symbol for an element, which two of the following symbols represent isotopes of the same element?
1 and 2
3 and 4
1 and 4
2 and 3
How is the number of neutrons in the nucleus of an atom calculated?
Add the number of electrons and protons together.
Subtract the number of electrons from the number of protons.
Subtract the number of protons from the mass number.
Add the mass number to the number of electrons.
Which of the following equals one atomic mass unit?
the mass of one electron
the mass of one helium-4 atom
the mass of one carbon-12 atom
one-twelfth the mass of one carbon-12 atom
What does the number 84 in the name krypton-84 represent?
the atomic number
the mass number
the sum of the protons and electrons
twice the number of protons
Isotopes of the same element have different
positions on the periodic table.
chemical behavior.
atomic numbers.
mass numbers.
How many protons, electrons, and neutrons does an atom with atomic number 50 and mass number 125 contain?
50 protons, 50 electrons, 75 neutrons
75 electrons, 50 protons, 50 neutrons
120 neutrons, 50 protons, 75 electrons
70 neutrons, 75 protons, 50 electrons
proton
the smallest particle of an element that retains the properties of that element
a positively charged subatomic particle
a negatively charged subatomic particle
a subatomic particle with no charge
the central part of an atom, containing protons and neutrons
Neutron
the smallest particle of an element that retains the properties of that element
a positively charged subatomic particle
a negatively charged subatomic particle
a subatomic particle with no charge
the central part of an atom, containing protons and neutrons
Nucleus
the smallest particle of an element that retains the properties of that element
a positively charged subatomic particle
a negatively charged subatomic particle
a subatomic particle with no charge
the central part of an atom, containing protons and neutrons
Atom
the smallest particle of an element that retains the properties of that element
a positively charged subatomic particle
a negatively charged subatomic particle
a subatomic particle with no charge
the central part of an atom, containing protons and neutrons
electron
the smallest particle of an element that retains the properties of that element
a positively charged subatomic particle
a negatively charged subatomic particle
a subatomic particle with no charge
the central part of an atom, containing protons and neutrons
