Three different atoms or atomic cations with 28 electrons

answer:

the chemical symbols for three different atoms or atomic cations with 27 electrons are

explanation:

an atom is neutral specie with equal number of electrons and protons in it.

atomic number =   number of protons = number of electrons

atomic number =- number electrons = 27

the atom with 27 atomic number cobalt that co.a cation is an ionic species which carry positive charge.when an atom looses an electron it forms cation.

copper has atomic number of 29. when the copper atom looses 2 electrons it get converted into copper cation that is   with 27 electrons in its ion.

nickel has atomic number of 28.when the nickel atom looses 1 electron it get converted into nickel cation that is   with 27 electrons in its ion.so,the chemical symbols for three different atoms or atomic cations with 27 electrons are

did this question in high school lol

it's c. elements are placed in rows based on how may valencies electrons have.

the answers would be

the first one and the second one