Old Dead Guys
This scientist discovered the electron using cathode ray experiments
J.J. Thomson
This subatomic particle has a charge of -1 and is found outside of the nucleus
electron
This number tells you how many protons are in an atom
atomic number
In an isotope, the number of this subatomic particle changes
neutrons
How does an atom become positively charged?
losing electrons
This ancient philosopher proposed that matter was made of tiny, indivisible particles called atoms with no experimental exivence
Democritus
This positively charged particle is located in the nucleus
proton
This number is equal to the number of protons + neutrons
mass number
Isotopes of the same element always have the same number of these subatomic particles
protons
Atom or group of atoms with a negative charge
anion
An early scientist proposed the first modern atomic theory and described atoms as solid, indivisible spheres with this model
Billiard Ball Model
This neutral particle was discovered by James Chadwick and is found in the nucleus
neutron
An atom has an atomic number of 8 and a mass number of 17. How many neutrons does it have?
H-1 and H-2 are isotopes of this element
hydrogen
An atom with 11 protons and 10 electrons has what charge?
+1
This scientist's experiment lead to the discovery of the nucleus as well as the notion that atoms are mostly empty space
Rutherford
Of the three major subatomic particles, this one has the smallest mass
electron
An atom has 15 protons, 16 neutrons, and 15 electrons. What are its atomic number and mass number?
atomic number is 15; mass number is 31
How many neutrons are in the isotope chlorine-37 if chlorine's atomic number is 17?
20
An ion has 17 protons, 18 electrons, and 20 neutrons. Identify the element, charge, and mass number
chlorine, -1, 37
The name for Thomson's atomic model in which electrons are embedded in a positively charged substance
Plum Pudding Model
An atom contains 17 protons, 18 neutrons, and 17 electrons. Identify the element and its charge.
Chlorine with a neutral charge
What is the difference between mass number and atomic mass?
Mass number is protons + neutrons (whole number). Atomic mass is the weighted average of an element's isotopes (decimal).
These units are used to describe values of atomic mass found directly on the periodic table
atomic mass units (amu)
An oxygen atom has 8 protons, 8 neutrons, and 10 electrons. What is the element's abbreviation?
816O-2