Isotopes
Ions
Subatomic Particles
Elemental Symbols
Periodic Table
Models
100
This term describes atoms of the same element with different numbers of neutrons.
Isotopes
100
Atoms become ions when they lose or gain these subatomic particles.
electrons
100
This subatomic particle has a positive charge
proton
100
The element with this atomic symbol (H)
hydrogen
100
The atomic number of aluminum
13
100
Prescribed the idea that matter is made of 1 of 4 elements: earth, fire, water, air.
Aristotle
200
The mass number of carbon-14
14
200
The charge of an ion with 17 protons and 18 electrons.
-1
200
These particles orbit the nucleus of an atom
electron
200
The element with this atomic symbol (Na)
Sodium
200
These elements are located in Group 17 of the periodic table.
halogens
200
Coined the idea that matter may not be broken down further, "attomos"
Democritus
300
Isotopes have the same number of these subatomic particles.
protons
300
This is the term for a positively charged ion.
cation
300
The subatomic particle with no charge
neutron
300
The element with this atomic symbol (Ho)
Holmium
300
A horizontal row on the periodic table is called this
period
300
Scientist that discovered this model
Bohr
400
The scientist who introduced the concept of the atom as indivisible.
Democritus
400
The ion formed by oxygen when it gains two electrons.
O2-
400
The location where protons and neutrons are found
nucleus
400
This elemental symbol for Mercury
Hg
400
The scientist credited with organizing the periodic table by atomic mass
Dmitri Mendeleev
400
Discovered there were nuclei using gold foil
Rutherford
500
The isotope with 11 protons, 12 neutrons, and 11 electrons.
sodium-23
500
The notation for an ion with 26 protons, 30 neutrons, and a 3+ charge
5626Fe3+
500
This particle determines the atomic number of an element
proton
500
The elemental symbol for Antimony
Sb
500
The element that has 22 neutrons and an atomic number of 18
Argon
500
The scientist that proposed this model.
Tompson