What is the last element in period 4?

Smog is the term used to describe the combination of fog and smoke

What approach is required to balance the objectives of sustainable development? balancing the objectives of sustainable development requires a(n) .

What type of interaction occurs between the r groups of valine and isoleucine in a tertiary structure? view available hint(s) what type of interaction occurs between the r groups of valine and isoleucine in a tertiary structure? salt bridge disulfide bridge hydrogen bond hydrophobic interaction