Question

Order the following elements according to increasing Zeff using periodic trends: Ca, Se, Kr, K.

Rank from smallest to largest. To rank items as equivalent, overlap them.

Answer 1

Answer: K, Ca, Se, Kr

Step-by-step explanation:

The periodic trend for Zeff is that it increases as you go across a period (row) from the left to the right. In the 4th row of the periodic table, the four elements of concern are in the following order from left to right: K, Ca, Se, Kr.