Which of the following would cause a physical change in a bar of steel?
a.) combining it with other substances to form new substances
b.) hammering it into a new shape
c.) putting it in water to form rust
d.) putting it in a box

Use the periodic table and your knowledge of isotopes to complete these statements. when polonium-210 emits an alpha particle, the child isotope has an atomic mass of 1-131 undergoes beta-minus decay. the chemical symbol for the new element is fluorine-18 undergoes beta-plus decay. the child isotope has an atomic mass of done intro donne