Boron has 5 electrons. How are the electrons distributed?
• $$3$$ in $$n=1$$ and $$2$$ in $$n=2$$
• $$5$$ in $$n=1$$
• $$2$$ in $$n=1$$ and $$3$$ in $$n=2$$
• $$2$$ in $$n=1$$, $$2$$ in $$n=2$$ and $$1$$ in $$n=3$$