question 10\nwhich of the following is an ionic compound?\n d.c3h8\n a.co2\n c.cao\n b.nh3\nquestion 11\nhow…

question 10\nwhich of the following is an ionic compound?\n d.c3h8\n a.co2\n c.cao\n b.nh3\nquestion 11\nhow many valence electrons does s2- have?\n a.8\n b.6\n c.16\n d.4\nquestion 12\ngroup 1 elements will primarily\n d lose two electrons\n a gain one electron\n c gain two electrons\n b lose one electron

question 10\nwhich of the following is an ionic compound?\n d.c3h8\n a.co2\n c.cao\n b.nh3\nquestion 11\nhow many valence electrons does s2- have?\n a.8\n b.6\n c.16\n d.4\nquestion 12\ngroup 1 elements will primarily\n d lose two electrons\n a gain one electron\n c gain two electrons\n b lose one electron

Answer

Explanation:

Step1: Recall ionic compound definition

Ionic compounds form from a metal and a non - metal. Ca (calcium) is a metal and O (oxygen) is a non - metal in CaO. CO2, NH3 and C3H8 are covalent compounds.

Step2: Recall valence electron concept for S²⁻

Sulfur (S) is in group 16 and has 6 valence electrons. S²⁻ has gained 2 electrons, so 6 + 2=8 valence electrons.

Step3: Recall Group 1 elements behavior

Group 1 elements have 1 valence electron and will lose this 1 electron to achieve a stable electron configuration.

Answer:

Question 10: C. CaO Question 11: A. 8 Question 12: B. lose one electron