Is carbon mixed with sand a homogeneous or heterogeneous mixture

Use examples from the article to explain one positive and one negative effect that chemistry has had on society

Which element in the third period would you expect to have the larger atomic radius, sodium (na) or sulfur (s)? a. sodium, because it has a higher effective nuclear charge attracting electrons in fewer energy levels. b. sodium, because it has fewer protons attracting electrons in the same energy levels. c. sulfur, because it has more protons attracting electrons in more energy levels. d. sulfur, because it has a higher effective nuclear charge attracting electrons in the same energy levels.

Which step in naming unsaturated hydrocarbons is used for alkenes but not alkynes