UR HELP IS VERY MUCH NEEDED I WAS VERY CONFUSED ON THIS. Match the following terms and definitions.

1.the smallest unit of an element
shell

2.the path surrounding the nucleus of an atom in which electrons are normally located

compound

3.the number of protons in the nucleus of the atom

neutron

4.a pure substance where atoms of two or more elements are chemically bonded to one another

diatomic

5.the positively charged center of an atom

atomic number

6.exists in orbit around the nucleus of an atom and carries a negative charge

molecule

7.the smallest unit of a pure substance that consists of two or more atoms held together by a chemical bond

atom

8.the mass of an element

atomic mass

9.a subatomic particle that carries no charge

nucleus

10.containing two atoms

proton

11.a subatomic particle with a positive charge

electron

shell

compound

neutron

diatomic

atomic number

molecule

atom

atomic mass

nucleus

proton

electron

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.