Consider the element with atomic number 43 in the modern periodic table. What is the exact atomic nu — Periodic Table and Periodicity Chemistry Question

💡 Solution & Explanation

The element with $Z=43$ is Technetium ($Tc$), which is a 4d transition element in the 5th period, Group 7. To find the element above it in the 4th period (which contains 18 elements), we subtract the period difference length. Atomic number = $43 - 18 = 25$, which corresponds to Manganese ($Mn$).