Question

1. this is the aufbau notation written below is for which of the following?

kr5s²4d¹⁰5p²=

a. antimony
b. mercury
c. tin
d. gold

Explanation:

Step1: Determine the atomic number from the electron configuration

The electron configuration \([Kr]5s^{2}4d^{10}5p^{2}\) means the element has \(36\) (from \(Kr\)) \(+ 2+10 + 2=50\) electrons. Since the number of electrons in a neutral atom is equal to its atomic number, the atomic number \(Z = 50\).

Step2: Identify the element based on atomic number

Looking at the periodic table, the element with atomic number \(Z = 50\) is Tin (\(Sn\)).

Answer:

C. Tin