Scientists
Give a modern example of J.J. Thomsons plum pudding model
chocolate-chip cookie model, rocky road ice cream model, fruitcake model...
Which two subatomic particles dwell within the nucleus?
protons and neutrons
Who composed the Periodic Table?
Dmitri Mendeleev formulated the Periodic Table
How do you find the charge of an atom (ion)
Ion Charge= # of protons- # of electrons
What did John Dalton theorize?
John Dalton theorized that:
-each element is composed of tiny indestructible particles called atoms.
-all atoms of a given element are the same mass
-atoms combine, in simple, whole number ratios to form compounds
Name each subatomic particle and their corresponding charges
Protons-Positive Charge
Neutrons-Neutral Charge
Electrons-Negative Charge
How is the Periodic Table organized?
Mendeleev organized the periodic table by mass because he theorized that if elements were organized by mass that certain properties between groups would arise.
What are isotopes?
Atoms with the same number of protons but different number of neutrons. (the change in number of neutrons affects MASS and not CHARGE)
Who coined the term "atoms"
Democritus coined the term "atoms" from the greek word 'atomos', meaning indestructible (which we now know is untrue).
Which two subatomic particles contribute to the charge of an atom?
protons and electrons
List the properties of Metals
- Conductor
- Malleable
- Ductile
-Loss of Electrons to form cations
What are valence electrons?
Valence electrons are the outermost electrons in the electron shells of atoms.
What did J.J. Thomsons plum pudding model highlight?
J.J Thomsons plum pudding model highlighted the existence of electrons
Which two subatomic particles contribute to the total mass of the atom?
protons and neutrons
mass = #protons + #neutrons
List the properties of Non-Metals
- Poor Conductors
- Gain Electrons to form anions
How do you find the atomic mass of an isotope?
Sum of (% Abundance x mass of isotope)
What did Ernest Rutherford's gold foil experiment prove?
Rutherford's experiment proved that;
- most of the atoms mass and all of its positive charge are stored in the nucleus
- most of the volume is empty space, aside from electrons floating outside the nucleus
- the number of electrons within the atoms will equal the number of protons in the nucleus, if the element is to be of balance charge
Which subatomic particles are attracted to each other?
protons and electrons are attracted to each other due to their opposite charges.
List the properties of Metalloids
- Semi-Conductors
- Electronic Devices
How many elements are there in nature?