Group 18, Period 1
Helium (He)
Protons have what kind of charge?
positive
substance made of one type of atom, cannot be broken down
element
Horizontal rows are called....
periods
Neon, Argon, Krypton are part of which family/group?
Noble Gas
Group 1, Period 1
Hydrogen (H)
What does "atomos" mean?
uncuttable
two or more elements are chemically combined
compound
Vertical columns are called...
groups
Why is water considered a compound and not a mixture?
Water is chemically combined and cannot be separated physically.
Group 13, Period 2
Boron (B)
Who discovered electrons?
J. J. Thomson
What is a mixture?
two or more substances that are physically combined.
How is the periodic table arranged?
by atomic weight, atomic number, reactiveness
This element group is highly reactive and rarely found uncombined in nature.
Alkali Metals
Group 17, Period 3
Chlorine (Cl)
Who said that electrons orbit the nucleus?
Niels Bohr
E, C or M?
Water
Compound
Who is considered the father of the Periodic Table?
Dmitri Mendeleev
Name an element in the Halogen family.
Bromine, Iodine, Chlorine, Fluorine
Group 13, Period 6
Mercury (Hg)
Where are protons and neutrons located?
The nucleus
E, C or M?
Copper
element
Which element is found in Group 2, Period 3?
Magnesium (Mg)