Question

ca²⁺
express your answers as integers. enter your answers separated by a comma.
view available hint(s)
np, ne = protons, electrons

Explanation:

Step1: Recall calcium atomic number

Calcium (Ca) has atomic number 20, so number of protons $N_p = 20$.

Step2: Consider ion charge

$Ca^{2 +}$ has lost 2 electrons. Neutral Ca has 20 electrons, so $N_e=20 - 2=18$.

Answer:

20,18