How is the mass number of an atom calculated? (1 point)
Responses
electrons plus neutrons
electrons plus neutrons
total number of protons
total number of protons
protons plus neutrons
protons plus neutrons
total number of electrons
protons plus neutrons
Which atom would be neutral?(1 point)
Responses
an oxygen atom with 16 electrons, 18 protons, and 16 neutrons
an oxygen atom with 16 electrons, 18 protons, and 16 neutrons
an oxygen atom with 4 electrons, 6 protons, and 4 neutrons
an oxygen atom with 4 electrons, 6 protons, and 4 neutrons
an oxygen atom with 8 electrons, 8 protons, and 9 neutrons
an oxygen atom with 8 electrons, 8 protons, and 9 neutrons
an oxygen atom with 9 electrons, 8 protons, and 8 neutrons
an oxygen atom with 8 electrons, 8 protons, and 8 neutrons
A nitrogen ion has a mass of 14 and a charge of +2. Which subatomic particles does it contain?(1 point)
Responses
2 protons, 6 neutrons, and 6 electrons
2 protons, 6 neutrons, and 6 electrons
7 protons, 7 neutrons, and 5 electrons
7 protons, 7 neutrons, and 5 electrons
7 protons, 7 neutrons, and 9 electrons
7 protons, 7 neutrons, and 9 electrons
4 protons, 4 neutrons, and 6 electrons
7 protons, 7 neutrons, and 5 electrons
Which option is an isotope with 6 protons and 8 neutrons? (1 point)
Responses
carbon-8
carbon-8
oxygen-14
oxygen-14
carbon-14
carbon-14
oxygen-6