Answer:
As quantitative data collection methods are often based on mathematical calculations, the data obtained that way is usually seen as more objective and reliable than qualitative. Some of the most common quantitative data collection techniques include surveys and questionnaires (with closed-ended questions).
Explanation:
Sources of heat from inside earth is radioactive decay and residual heat.
Depends which elements are listed.
However, I will tell you that the first shell can only be occupied by a maximum of two electrons and the rest after that can have a maximum of 8 :)
