What volume of hydrogen (in L) is produced from the complete reaction of 56.49 g of
magnesium metal at STP?
(Mg = 24.30 g/mol)
Mg(s) + 2HCl(aq)
MgCl2(aq) + H2 (8)
Hint: 1 mole of gas at STP occupies 22.4L

Idid the calculation and i get 875,000,000 which can be written as 8.75 x 10^6?

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