If the penny color is changed, will the mass change? and why?

answer:

explanation:

in 1943, the content of the coin was changed to zinc coated steel because of the copper shortage during world war ii. then after 1982, the compostion was 97.6% zinc, and 2.4% copper. so this means that the pennies made before 1982 will have a different mass from those made after 1982.

that's what i got you can count the number of atoms

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.