Intro to Atoms
Elements
Metals
Nonmetals and Metalloids
Radioactive Elements
100
Which parts of the atom have a negative charge and move around the nucleus?
electrons
100
Mendeleev created the first periodic table by arranging elements in order of
increasing atomic mass
100
Which group contains the most elements?
Metals
100
This is the most common element in the universe
Hydrogen
100
Alpha and beta decay are almost always accompanied by
gamma radiation
200
What name is given to the part of the atom that contains the electrons?
electron cloud
200
Rows or columns all have similar characteristics?
Columns.
Rows have properties that change in a pattern.
200
A material is said to be ductile if it
can be made into wire
200
Which group of elements have some properties of metals and some properties of nonmetals?
Metalloids
200
Of the three major types of nuclear radiation, what is the weakest?
Alpha
300
Who discovered that that an atom’s positive charge must be packed in a tiny region in its center.
Ernest Rutherford
300
In the periodic table, the most reactive metals are found
in Group 1
300
Which elements are malleable, ductile, and can carry an electric current.
metals
300
Group 17 is so reactive that many of its elements are already in __________.
parts, substances, compounds, or properties
compounds
300
These radioactive isotopes can be followed through the steps of a chemical reaction.
tracers
400
Who discovered the electron?
J.J. Thomson
400
The atomic number of an element is based on the
number of protons in the nucleus.
400
Groups 3-12 are called the _____________ metals.
transition
400
Two of the same atoms bonded together is called a(n)
diatomic molecule
400
Looking at a Periodic Table, name an element (or Chemical Symbol) that has similar properties of Nickle (Ni).
Pd Palladium or Pt Platinum or Ds Darmstadtium
(any in the same column)
500
This man’s model of the atom looked like a sphere or marble
Dalton
500
The elements that are unreactive are the
Noble gases
500
Group 2 metals are harder, denser, and melt at higher temperatures than Group 1 metals. Group 1 metals are Alkali Metals. What are Group 2 metals called?
Alkaline Earth Metals
500
Halogens react to form_____________.
salts
500
If Carbon-14 decays to produce a beta particle, what element is created? (Beta Decay)
Nitrogen-14