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100
a stable subatomic particle occurring in all atomic nuclei with a positive electric charge
proton


100

the smallest unit of matter

atom


100

the system of electrons surrounding the nucleus of an atom.

 orbit / shell

100

the group number of chlorine

VII

200

a subatomic particle of about the same mass as a proton but without an electric charge

neutron

200

electrons found in the outermost shell

valence

200

the group of elements in VIII

noble gases

200

the summary of the research paper

abstract

300

a stable subatomic particle with a charge of negative electricity

electron

300
  a scientific model of all the elements
periodic table


300

the process of writing the resources used in the research paper

citation

300

the number of protons in the nucleus of an atom

atomic number

400

How many shells does potassium have?

4


400
the arrangement of electrons in the atom

configuration 






400

the number of electrons the d-shell can hold

10

400

the mass of an atom of a chemical element expressed in atomic mass units.

atomic mass

500

a natural event or activity happening

phenomenon

500

the group name of boron

metalloids

500

atomic mass of oxygen

16amu

500

the first part of a research proposal

title