Question

what is the difference between the number of electrons in an atom of selenium and the number of electrons in an atom of aluminum

Answer 1

21 electrons

Step-by-step explanation:

just subtract their atomic numbers since the atomic number has the same amount of electrons as it has protons

Answer 2

21 electrons

Step-by-step explanation:

The number of electrons in an atom is equal to the atomic number of the element. Atomic number of aluminium is 13 and atomic number of selenium is 34. That means electrons of aluminium are 13 and electrons of selenium are 34. Thus, difference between number of electrons of these atoms is:

34 - 13 = 21 electrons

I hope it helps!