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halltho
Simple. The atomic number is the number of protons (12) and the mass number is the number of neutrons and protons combined. So you'd subtract 12 from 25 (25-12=) and that'd get you 13 as your answer. If you need to find the number of electrons, it'll be the same as the number of protons unless it has a certain charge and if it does, if it's positive it has more protons (+) than electrons (-), if it is negative it has more electrons (- negatively charged) than protons (+ positively charged)

The atom have 13 neutrons .

Calculation,

Atomic number = Number of  electrons/protons = 12

Mass number = Number of  electrons/protons + number of neutrons = 25

Number of neutrons = 25 - Number of  electrons/protons

Number of neutrons = 25 - 12 (given) = 13

What is mass number?

Mass number is the sum of number of electrons/protons and number of neutrons.

Mass number of calcium is 40 and Atomic number is 20.

What is atomic number?

Atomic number is the sum of number of electrons/protons.

Example atomic mass of Carbon is 6 , it means carbon atom contains 6 electrons or protons

learn about Mass number

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