Identify the following atoms or ions, and where possible, write the symbol for the specific isotope. If not enough information is given to answer the question, say so. a. A 2+ cation with 20 protons and 20 neutrons b. A metal atom with 63 neutrons c. A 3+ cation with 23 electrons and 30 neutrons d. A 2-‐ anion with 34 protons.

Question

Identify the following atoms or ions, and where possible, write the symbol for the specific  isotope. If not enough information is given to answer the question, say so.  a. A 2+ cation with 20 protons and 20 neutrons  b. A metal atom with 63 neutrons  c. A 3+ cation with 23 electrons and 30 neutrons  d. A 2-­‐ anion with 34 protons.

littlebird · Answer

My guesses;
a Ca-40
b not enough information
c Fe-56
d Se-79

photon336 · Answer

@Littlebird the number of protons = the identity of the element, the number of electrons and neutrons could be different

photon336 · Answer

a, you're correct 
b. you need to know at least the number of protons or electrons not enough info 
c. It must have had 26 protons and 23 electrons to give +3 has to be iron Fe
d. 34 protons this is easy that's selenium.