Question

fill in the missing information:
| symbol | atom or ion?
check all that apply | number of
protons | number of
electrons |

	☐ neutral atom ☐ cation ☐ anion	14	13
	☑ neutral atom ☐ cation ☐ anion	4
$ce{se^{2-}}$	☐ neutral atom ☐ cation ☐ anion

Explanation:

Step 1: First row (protons=14, electrons=13)

• For an atom/ion, the number of protons is the atomic number. Atomic number 14 is for Silicon (Si).
• A neutral atom has protons = electrons. Here, protons (14) > electrons (13), so it's a cation (positive ion, lost an electron). So symbol is Si, and check cation.

Step 2: Second row (neutral atom, protons=4)

• A neutral atom has protons = electrons. Atomic number 4 is Beryllium (Be). So electrons = 4. Symbol is Be.

Step 3: Third row (\( \text{Se}^{2-} \))

• Selenium (Se) has atomic number 34 (so protons = 34).
• An anion (\( \text{Se}^{2-} \)) has gained 2 electrons. Neutral Se has electrons = 34, so \( \text{Se}^{2-} \) has \( 34 + 2 = 36 \) electrons. Also, since it has gained electrons, it's an anion (check anion).

Answer:

symbol	atom or ion? (check all that apply)	number of protons	number of electrons
Be	neutral atom (checked), cation (uncheck), anion (uncheck)	4	4
\( \text{Se}^{2-} \)	anion (checked), neutral atom (uncheck), cation (uncheck)	34	36

(For the checkboxes: In first row, check "cation"; second row, check "neutral atom"; third row, check "anion".)