Question

an atom that contains six protons must have a mass number of 12 must be a carbon atom must have six neutrons must have six electrons has a mass of 12.01

Explanation:

Step1: Define atomic number

The number of protons in an atom is its atomic number.

Step2: Identify element

Carbon has an atomic number of 6, so an atom with six protons must be a carbon atom.

Step3: Analyze other options

• Mass number = protons + neutrons. Without knowing neutrons, we can't say mass number is 12.
• Neutron number can vary (isotopes), not always 6.
• In a neutral atom, electrons = protons, but not specified neutral here.
• Mass depends on isotopes and is not always 12.01.

Answer:

B. must be a carbon atom