Question

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an atom of gallium - 70 has an atomic number of , and a mass number of . it has protons, electrons, and neutrons.

Explanation:

Step1: Recall atomic number concept

The atomic number of an element is unique. Gallium has an atomic number of 31.

Step2: Identify mass number

Given as gallium - 70, so mass number is 70.

Step3: Determine proton number

Proton number = atomic number, so 31 protons.

Step4: Find electron number

For a neutral atom, electron number = proton number, so 31 electrons.

Step5: Calculate neutron number

Neutron number = mass number - atomic number = 70 - 31 = 39.

Answer:

Atomic number: 31, Mass number: 70, Protons: 31, Electrons: 31, Neutrons: 39