Which element would be expected to have a similar physical and chemical properties as oxygen, and why?

What is important to study for nios grade 12 chemistry? i have only one month left.

Which other elements contain the same number of outer electrons as sodium

After watching the video "zinc strip in copper nitrate solution", and reading the instructions, click on the link labeled "start" just below the drawing of the pencil tip. follow the direction to complete the 3x3 grid. answer the below questions for the portion of the activity in which sn(s) is placed in agno3(aq)