Find the concentration (M) of a solution prepared when 2.50 mol NaCl are dissolved in
enough water to make 20.0 L solution.

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom

Hi + naoh -> h2o + nal

The fraction of an original sample of tritium that remains unchanged after 24.62 years is 1/4. if you need the percentage it is 25%