use the periodic table to identify the element represented by each of the following electron…

use the periodic table to identify the element represented by each of the following electron configurations.\nhe2s²:\nne3s²3p⁵:\nxe6s¹:\nar4s²3d⁹:\ndone

use the periodic table to identify the element represented by each of the following electron configurations.\nhe2s²:\nne3s²3p⁵:\nxe6s¹:\nar4s²3d⁹:\ndone

Answer

Explanation:

Step1: Recall noble - gas core concept

The noble - gas core represents the electron configuration of the nearest noble gas with a lower atomic number. Add the electrons outside the noble - gas core to the atomic number of the noble gas.

Step2: Analyze [He]2s²

Helium (He) has 2 electrons. The configuration [He]2s² has 2 + 2=4 electrons. The element with 4 electrons is beryllium (Be).

Step3: Analyze [Ne]3s²3p⁵

Neon (Ne) has 10 electrons. The configuration [Ne]3s²3p⁵ has 10+2 + 5=17 electrons. The element with 17 electrons is chlorine (Cl).

Step4: Analyze [Xe]6s¹

Xenon (Xe) has 54 electrons. The configuration [Xe]6s¹ has 54+1 = 55 electrons. The element with 55 electrons is cesium (Cs).

Step5: Analyze [Ar]4s²3d⁹

Argon (Ar) has 18 electrons. The configuration [Ar]4s²3d⁹ has 18+2 + 9=29 electrons. The element with 29 electrons is copper (Cu).

Answer:

[He]2s²: Be [Ne]3s²3p⁵: Cl [Xe]6s¹: Cs [Ar]4s²3d⁹: Cu