Question

complete the information for an atom of arsenic - 75. the atom has an atomic number of - select -. it has - select - protons. the mass number of the atom is - select -. each atom of arsenic - 75 has - select - electrons and - select - neutrons.

Explanation:

Step1: Recall atomic number concept

The atomic number of an element is unique. For arsenic, it is 33.

Step2: Relate atomic number to protons

The number of protons is equal to the atomic number. So, there are 33 protons.

Step3: Identify mass number

Given as arsenic - 75, so the mass number is 75.

Step4: Determine number of electrons

In a neutral atom, number of electrons = number of protons. So, 33 electrons.

Step5: Calculate number of neutrons

Number of neutrons = mass number - atomic number. So, $75 - 33=42$ neutrons.

Answer:

The atom has an atomic number of 33. It has 33 protons. The mass number of the atom is 75. Each atom of arsenic - 75 has 33 electrons and 42 neutrons.