What trend does first ionization energy follow, going across the periodic table

What is the temperature in kelvin of a gas if it is allowed to expand from 1.50 l to 4.50 l? the initial temperature is 10.0°c and pressure is constant throughout the change. which equation should you use? t2= v2/v1 t1 what is the final temperature? ⇒ 849 k these are the answers.

What properties would have caused early researchers to name hydrogen "inflammable air”

Which number should be placed before f2 on the reactants side equation to make equation balanced? xe + > xef4