Question

question 54 (2 points)
how many electrons does the ion ca²⁺ contain?
blank 1:

Explanation:

Step1: Find the atomic number of Ca

The atomic number of calcium (Ca) is 20. For a neutral atom, the number of electrons equals the atomic number. So, a neutral Ca atom has 20 electrons.

Step2: Consider the ion charge

The ion \(Ca^{2 +}\) has a +2 charge. A positive charge means the ion has lost electrons. A +2 charge implies that 2 electrons have been lost.

Step3: Calculate the number of electrons in \(Ca^{2+}\)

We use the formula \(n_{e^{-}}=\text{atomic number}-\text{charge}\). Substituting the values, \(n_{e^{-}} = 20- 2\).

Answer:

18