Which element does this atom represent? = proton
key: O-neutron
= electron
sodium
ОООО
oxygen
α. ο σ
potassium
neon

11. phosphorus-32 is radioactive and has a half life of 14 days. how much of a 124 mg sample of phosphorus-32 is present after 56 days? a) 7.75 mg b) 15.5 mg c) 31.0 mg d) 62.0 mg

What two factors can affect the properties of a hydrocarbon? a. the number of its carbon atoms and the number of single bonds b. the number of its carbon atoms and the arrangement of its atoms c. the arrangement of its atoms and the number of its double bonds

Why is it incorrect to balance a chemical equation by changing the subscripts? explain.