Which of the following elements would be expected to resemble strontium (sr) most closely in chemical properties?
1. li
2. ba
3. sc
4. cs
5. si

Can someone me with these questions plz.

Carbon-14 undergoes radioactive decay in the reaction above. determine the type of radiation emitted in this reaction and describe what is happening to the nucleus during this reaction.

Harry lives in a city, and he has a lung condition known as asthma. on certain days, harry has to stay inside because pollutants in the air make it difficult for him to breathe. which of these pollution sources are nonpoint sources that might bother harry if he goes outside? choose the two that apply.