ATOMIC THEORIES
In 1911, _____________found evidence that challenged Thomson's model. He aimed a beam of positively charged particles at a thin sheet of _________ foil surrounded by a fluorescent coated detector. He theorized that atoms are mostly empty space but has a dense, positive charge at it's center or __________.
Rutherford, Gold, Nucleus
The nucleus contains ______ and ______.
Protons, Neutrons
Columns in the periodic chart are called.
Groups
How reactive an element is and how it bonds with other elements is based on its ____________ property.
Chemical
What group is the most reactive on the Periodic Chart?
_________ Metals
Alkali
In 1932, this English scientist showed that another particle exists in the nucleus of the atom. Who was he and what was the particle?
Chadwick, Neutron
There are 3 Isotopes of Oxygen. Oxygen-16 contains 8 protons and 8 neutrons. How many protons and how many neutrons would Oxygen-18 have?
8 protons, 10 neutrons
Rows in the Periodic Chart are called.
Periods
What type of property is the melting point of an element?
Melting Point, Physical Property
How many Valence electrons are in the outer ring of
Neon __ Group 18
Chlorine __ Group 17
8, 7
This Danish scientist, was one of Rutherford's students and in 1913, he revised the atomic model to show orbit rings around the nucleus of the atom. Who is the scientist and what particle is in these rings?
Bohr, Electrons
The protons and neutrons provide what number on the periodic chart box for each element.
Mass Number
Who developed the first periodic chart to organize known elements of the time?
Dmitri Mendeleev
Why are Chemical Symbols sometimes not representing the name of the element? Such as Pb for Lead.
Different languages have been used when naming elements over time.
Lanthanides vs. Actinides
Which ones are the "Rare-Earth Metals" that are found as naturally occurring elements?
Which ones are radioactive and mostly man-made elements?
Lanthanides / Actinides
In 1897, this scientist discovered that atoms contain negatively charged particles. He reasoned that atoms must also contain the same amount of positive particles as well. Who is he?
J.J. Thomson
Looking at a Periodic Chart, how would I know how many electrons it has?
Atomic Number
The average mass of all the ________ of an element gives us atomic mass.
Isotopes
What is the physical property that describes how shiny or reflective it is?
Luster
Gold, Silver, Iron, Copper are all what category of elements? Group 3-12
Transition Metals
Name these 2 dudes that developed the first Atomic Theories..... Around 430 BC, this Greek Philosopher believed that matter was formed from small pieces that could not be cut into smaller parts. Came up w/ the term "Atom" Then in the 1600's __________ theorized that all element consist of atoms, atoms of the same element have the same mass, elements cannot be changed through a bond, and that compounds are formed at specific ratios.
Democritus, John Dalton
This atomic model was developed around the 1920s, and was supported by Bohr's Model
Cloud Model
Name 2 of the 4 properties that Mendeleev used to organize the first Periodic Chart.
Melting point, density, color, atomic mass
ID the Physical Property
1. Metal such as gold is easy to be hammered out in sheets __________
2. Metal such as copper being pulled out into long wires ___________
Malleable, Ductile
Carbon, Nitrogen, Oxygen are what category of elements?
Which group are "salt-forming" and found in Group 17?
Non-Metals, Halogens