c) List an element that would be similar to potassium in properties and reactivity. Explain your reasoning. ​

Group 1A (or IA) of the periodic table are the alkali metals: hydrogen (H), lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). These are (except for hydrogen) soft, shiny, low-melting, highly reactive metals, which tarnish when exposed to air.

you need to stop taking that class

50.23 i believe is correct but don't quote me on that.