Three sections of the periodic table are labeled A, B, and C in the image below. Which of the following statements is most likely true for an element present in section B?

It is a highly reactive metal.
It is an inert gas at room temperature.
It may act as an insulator or a conductor.
It is a highly reactive liquid at room temperature.

Sorry i dont understand the question can you rephase it?

Polyethylene is a strong synthetic polymer that can be used to make toys and bottles. this makes plastics which are important also to people but sometimes it lead to harmful environmental effects such as global warming if these plastics are burned.

Ican't see the chart but the density of both nickel and cobalt is 8.90 g/cm3, so it would be one of those.

In order to improve results, many different steps can be taken into account. 1) using more precise scales and thermometers is always something that should be considered as being precise means that you are more exact with your answer.2) increasing the sample size should also be considered, if you have a bigger sample size you are able to determine if your results are accurate as well as if there are any variables that should be taken into account plus it assists in the statistical analysis and produces overall better data3) using better handwriting is also a plus, along with organizing the data properly so that others are also able to read the results and even redo the experiment in the future if it is needed.