Atom A has six protons , five neutrons and five electrons. Atom B five protons , six neutrons, and five electrons . Are atoms A and B of the same element ? 1. no, because they do not have the same number of protons

2. no, because they do not have the same number of neutrons

3. yes , because they have the same number of electrons

4. yes , because both have 16 protons , neutrons, and electrons combined

no, because they do not have the same number of protons

Explanation:

No of protons represents atomic number which decides the characteristics of an atom . Two atoms having same number of protons but different number of neutrons are same element . They differ only in some physical characteristics . They are called isotopes . In respect of chemical properties they are same .  In a neutral element number of protons and number of electrons are same . But in some case number of electrons may differ . In that case they form ions of the element . In positive ion , number of electrons is shorter than number of protons .

In the present case , atom A and atom B differ in respect of number of protons so they represent different element .

b is the correct answer