3) Which element has the least metallic character?* A) sodium (Na)
B) beryllium (Be)
C) potassium (K)
D) magnesium (Mg)

Calculate the energy required to ionize a hydrogen atom to an excited state where the electron is initially in the n = 5 energy level. report your answer in kilojoules

What are the two largest greenhouse gases

Scientists are often interested in knowing the molar heat of combustion – the heat released during the combustion of one mole of a substance. use the periodic table to find molar masses. how many moles of ethanol are present in the sample?