Question

Виконайте 17 и 18 вправу до завтра будь-ласка

Answer 1

17 "it follows that the smallest part of a compound that can exist

must contain at least two different atoms. This is called a molecule." This excerpt confirms the main idea of the text, which is that molecules are the smallest particles that can exist alone in compounds and that they consist of at least two different atoms.

18 Atoms are the smallest parts of elements and can take part in chemical reactions, but they often don't exist alone. Compounds must contain at least two different elements, which form molecules. Molecules can be diatomic or monoatomic, with friendly gases often occurring in pairs to form diatomic molecules while argon, helium, and neon occur alone. Some compounds contain complex molecules with hundreds of atoms. Electron microscopes can photograph these large molecules, but they are still too small to be seen through optical microscopes.