Question

an element has an electron configuration of [ar]4s23d104p5. which of the following is/are true about the element? select all statements that are true about the element.The element is Se. The element is a halogen The element has one fewer electron than the following noble gas. When the element reacts with a metal, the elements tends to gain one electron to form an anion with a 1-charge.

Answer 1

The element with the electron configuration [Ar]4s23d104p5 is Selenium (Se). It has one fewer electron than the noble gas argon. When selenium reacts with a metal, it tends to gain one electron to form an anion with a 1 charge.

Step-by-step explanation:

The element with the electron configuration [Ar]4s23d104p5 is Selenium (Se).

The statement that is true about the element is: The element has one fewer electron than the following noble gas. The noble gas with the electron configuration [Ar] is argon (Z = 18), and selenium (Z = 34) has one fewer electron, making the statement true.

When the element reacts with a metal, selenium tends to gain one electron to form an anion with a 1-charge. This is because selenium is located in Group 16 (Chalcogens) of the periodic table and tends to gain two electrons to achieve a stable noble gas configuration, forming the Se2- ion.

Answer 2

The element with the electron configuration [Ar]4s2 3d10 4p5 is bromine (Br), a halogen that forms an anion with a 1- charge by gaining one electron.

Step-by-step explanation:

The electron configuration of [Ar]4s23d104p5 indicates that the element is one electron short of having a full p subshell. This configuration corresponds to the element bromine (Br), which is in the halogen group. Halogens are known for having seven electrons in their outermost p subshell and for their tendency to gain one electron to achieve a noble gas electron configuration, forming an anion with a 1- charge.

Therefore, the statements that are true about the element with this electron configuration are: The element is a halogen, The element has one fewer electron than the following noble gas, and When the element reacts with a metal, the element tends to gain one electron to form an anion with a 1- charge. The statement that The element is Se is incorrect because selenium (Se) has an electron configuration of [Ar]4s23d104p4.