Question

fill in the missing information: symbol atom or ion? check all that apply number of protons number of electrons o²⁻ neutral atom cation anion 29 29 neutral atom cation anion 41 39

Explanation:

Step1: Analyze $O^{2 -}$

The atomic number of oxygen (O) is 8, so the number of protons is 8. Since it is an anion with a - 2 charge, the number of electrons is $8 + 2=10$.

Step2: Analyze the second row

If the number of protons is 29, the element is copper (Cu). Since the number of protons equals the number of electrons (29), it is a neutral atom, and the symbol is Cu.

Step3: Analyze the third row

If the number of protons is 41, the element is niobium (Nb). Since there are 41 protons and 39 electrons, it has a + 2 charge, so it is a cation. The symbol is $Nb^{2+}$.

Answer:

symbol	atom or ion? check all that apply	number of protons	number of electrons
Cu	neutral atom	29	29
$Nb^{2+}$	cation	41	39