Question

write the symbol of each neutral element based on its written electron configuration: 1s²2s²2p⁶3s²3p⁶4s²3d³ 1s²2s²2p⁶3s²3p⁶4s¹3d¹⁰ 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶

Explanation:

Step1: Count electrons in first configuration

Add up the exponents: $2 + 2+6 + 2+6+2 + 3=23$.

Step2: Identify element with 23 electrons

The element with 23 electrons is Vanadium, symbol V.

Step3: Count electrons in second configuration

Add exponents: $2 + 2+6 + 2+6+1 + 10=29$.

Step4: Identify element with 29 electrons

The element with 29 electrons is Copper, symbol Cu.

Step5: Count electrons in third configuration

Add exponents: $2 + 2+6 + 2+6+2 + 10+6+2 + 10+6=54$.

Step6: Identify element with 54 electrons

The element with 54 electrons is Xenon, symbol Xe.

Answer:

1. V
2. Cu
3. Xe