Question

question 51 (2 points)
how many electrons are there in the highest occupied energy level of atoms in group 5a elements?
blank 1:
question 52 (2 points)
how many electrons are present in the d sublevel of a neutral atom of nickel?
blank 1:
question 53 (2 points)
how many electrons are in a rubidium ion (rb⁺)?
blank 1:
question 54 (2 points)
how many electrons does the ion ca²⁺ contain?
blank 1:

Explanation:

Question 51

Step1: Recall group - electron relation

Elements in Group \(nA\) have \(n\) electrons in the highest - occupied energy level. For Group \(5A\) elements, \(n = 5\).

Question 52

Step1: Write the electron configuration of nickel

The atomic number of nickel (\(Ni\)) is \(28\). The electron configuration of \(Ni\) is \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{8}\). The \(d\) - sublevel electrons come from the \(3d\) orbital.

Question 53

Step1: Determine the atomic number of rubidium

The atomic number of rubidium (\(Rb\)) is \(37\). A \(Rb^{+}\) ion has lost one electron. So the number of electrons is \(37- 1=36\).

Question 54

Step1: Determine the atomic number of calcium

The atomic number of calcium (\(Ca\)) is \(20\). A \(Ca^{2 +}\) ion has lost two electrons. So the number of electrons is \(20 - 2=18\).

Answer:

Question 51: \(5\)
Question 52: \(8\)
Question 53: \(36\)
Question 54: \(18\)