What two atoms are isotopes pf one another?

What semimetal can form four single covalent bonds.

Indicate whether the specified alkyl halides will form primarily substitution products, only elimination products, both substitution and elimination products, or no products when they react with sodium methoxide. 1-bromobutane 1-bromo-2-methylpropane 2-bromobutane 2-bromo-2-methylpropane

Adepositional also feature that forms where a stream enters a lake or an ocean is a