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Which statement about subatomic particles is true?
The electron has gained energy.
The number of protons in the nucleus does not equal the number of neutrons.
the number of protons
An electron has far less mass than either a proton or neutron.
period
atomic number.
the sum of the protons and neutrons in one atom of the element.
They are isotopes of oxygen.
The mass number of an element is
The electron has gained energy.
The number of protons in the nucleus does not equal the number of neutrons.
the number of protons
An electron has far less mass than either a proton or neutron.
period
atomic number.
the sum of the protons and neutrons in one atom of the element.
They are isotopes of oxygen.
The number of protons in one atom of an element is that element’s
The electron has gained energy.
The number of protons in the nucleus does not equal the number of neutrons.
the number of protons
An electron has far less mass than either a proton or neutron.
period
atomic number.
the sum of the protons and neutrons in one atom of the element.
They are isotopes of oxygen.
Which of the following is unique for any given element?
The electron has gained energy.
The number of protons in the nucleus does not equal the number of neutrons.
the number of protons
An electron has far less mass than either a proton or neutron.
period
atomic number.
the sum of the protons and neutrons in one atom of the element.
They are isotopes of oxygen.
Which statement is true about oxygen-17 and oxygen-18?
The electron has gained energy.
The number of protons in the nucleus does not equal the number of neutrons.
the number of protons
An electron has far less mass than either a proton or neutron.
period
atomic number.
the sum of the protons and neutrons in one atom of the element.
They are isotopes of oxygen.
Suppose an atom has a mass number of 23. Which statement is true beyond any doubt?
The electron has gained energy.
The number of protons in the nucleus does not equal the number of neutrons.
the number of protons
An electron has far less mass than either a proton or neutron.
period
atomic number.
the sum of the protons and neutrons in one atom of the element.
They are isotopes of oxygen.
What can you assume has happened if an electron moves to a higher energy level?
The electron has gained energy.
The number of protons in the nucleus does not equal the number of neutrons.
the number of protons
An electron has far less mass than either a proton or neutron.
period
atomic number.
the sum of the protons and neutrons in one atom of the element.
They are isotopes of oxygen.
A horizontal row on the periodic table is called
The electron has gained energy.
The number of protons in the nucleus does not equal the number of neutrons.
the number of protons
An electron has far less mass than either a proton or neutron.
period
atomic number.
the sum of the protons and neutrons in one atom of the element.
They are isotopes of oxygen.
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