Question

A)How is the mass number of an atom calculated? (1 point)
Responses

total number of electrons
total number of electrons

protons plus neutrons
protons plus neutrons

electrons plus neutrons
electrons plus neutrons

total number of protons
total number of protons
Question 2
A)Which atom would be neutral?(1 point)
Responses

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 4 electrons, 6 protons, and 4 neutrons
an oxygen atom with 4 electrons, 6 protons, and 4 neutrons

an oxygen atom with 9 electrons, 8 protons, and 8 neutrons
an oxygen atom with 9 electrons, 8 protons, and 8 neutrons

an oxygen atom with 16 electrons, 18 protons, and 16 neutrons
an oxygen atom with 16 electrons, 18 protons, and 16 neutrons
Question 3
A)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

4 protons, 4 neutrons, and 6 electrons
4 protons, 4 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
Question 4
A)Which option is an isotope with 6 protons and 8 neutrons? (1 point)
Responses

oxygen-14
oxygen-14

carbon-14
carbon-14

oxygen-6
oxygen-6

carbon-8

Answer 1

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.)