elements
polyatomic ions
doctors
terms 1
terms 2
100

H

Hydrogen

100

NH4+

Ammonium

100

who coined the term radioactivity 

Marie Curie

100

An electricly charged atom

Ion

100

a positively charged ion

cation

200

Ne

Neon

200

NO3-

Nitrate

200

who constructed the periodic table 

Mendeleev

200

a negatively charged ion  

Anion

200

the electrical attraction between to charged ions

ionic bond

300

Au

Gold

300

NO2-

Nitrite

300

who proved three fundamental laws of gravity 

Newton

300

a bond formed by sharing electrons

covalent bond

300

a moleqular representation of an atom and its electrons with the use of dots

Lewis dot structure

400

Hg

Mercury

400

CN-

Cyanide

400

the first modern chemist

Robert Boyle

400

the reactant that runs out first

Limiting regant

400

the susceptibility to dissolve in liquid

solubility 

500

Pb

Lead

500

PO43-

phosphate

500

who discovered the principles of vacination

Louis Pasteur

500

the gaining of an electron in an atom

reduction

500

absorbs heat

endothermic