Question

Someone help me please i need to finish this

Answer 1

Answer:

D. A zinc Zn contains 30 protons inside the nucleus and 30 electron outside the nucleus

Answer 2

Answer:

the last option is correct

Explanation:

see I won't explain all the points but will tell you the concept being used.

• protons and neutrons are inside the nucleus in an atom while the electrons are outside the nucleus.

• the mass number of an atom is equal to the sum of number of electrons and neutrons in an atom
• atomic number is equal to the number of electrons which is equal to the number of protons in an atom
• no. of electrons/ protons is always less than that of neutrons and they're almost equal( a large difference ain't obtained between the number of electrons and that of neutrons.

since, the rest of the options are violating the above rules they're incorrect