Ayudeneme es de quimica elemental solo son los ejercicios de mayor y menos

What’s the scientific notation for the number 6,840,000,000

Brainliesttt me asap! the below reaction can be categorized as more than one type of reaction. which reactions are these, and what are the types of reactions?

According to periodic trend, which of the following most likely has the highest ionization energy? kr be ni sc