Here are the correct responses to each question:
Question 1
A) The mass number of an atom is calculated by:
Response: protons plus neutrons
Question 2
A) Which atom would be neutral?
Response: an oxygen atom with 8 electrons, 8 protons, and 9 neutrons
(Note: An atom is neutral if it has an equal number of protons and electrons. The other options have a different number of protons and electrons.)
Question 3
A) A nitrogen ion has a mass of 14 and a charge of +2. Which subatomic particles does it contain?
Response: 7 protons, 7 neutrons, and 5 electrons
(Explanation: A nitrogen atom has 7 protons and typically 7 neutrons, but since the charge is +2, it has lost 2 electrons.)
Question 4
A) Which option is an isotope with 6 protons and 8 neutrons?
Response: carbon-14
(Explanation: Carbon has 6 protons, and when it has 8 neutrons, its mass number becomes 14. The notation 'carbon-14' indicates this isotope.)