Question

when a ca metal atom loses both of its valence electrons it attains an electronic configuration that is isoelectronic with (or same as) that of ____________. the alkali metal potassium the halogen bromine the transition metal scandium the noble gas ar question 2 1 pts an ion with a 2 - charge is isoelectronic with krypton. which element is it? sulfur selenium oxygen bromine

Explanation:

Step1: Analyze Ca electron - loss

Calcium (Ca) has an atomic number of 20. Its electron configuration is [Ar]4s². When it loses both valence electrons, it has 18 electrons, which is the same as the number of electrons in argon (Ar) (atomic number 18).

Step2: Analyze ion isoelectronic with krypton

Krypton (Kr) has an atomic number of 36. An ion with a 2 - charge is isoelectronic with krypton. Let the atomic number of the element be \(x\). If the ion has a 2 - charge, it means it has gained 2 electrons. So \(x + 2=36\), then \(x = 34\). The element with atomic number 34 is selenium (Se).

Answer:

Question 1: the noble gas Ar
Question 2: selenium