Atoms and Matter
What is the smallest unit of matter?
Atom
The Periodic Table is a list of all known ________.
Elements
Heat always flows from _______ to _______.
Hot to Cold
What type of matter is pure and made of only one kind of atom?
Element
A positively charged ion is called a ________.
Cation
Which subatomic particle determines the identity of an element?
Proton
What group of elements has full valence electron shells?
Noble Gases
What is the measure of average kinetic energy of particles?
Temperature
Which type of matter is chemically combined: element, compound, or mixture?
Element
A negatively charged ion is called a ________.
Anion
True or False: Atoms are alive.
False
Which scientist created the first version of the Periodic Table?
Dmitri Mendeleev
At what temperature does water boil in Celsius?
100°C
Which mixture has particles large enough to settle or be filtered?
Suspension
What do we call the “magic number” of valence electrons that makes atoms stable?
8 (Octet Rule)
Where are electrons located in an atom?
Outside the nucleus
All elements in the same period share the same number of what?
Energy shells/orbitals
What is the temperature at which atoms stop moving called?
A homogeneous mixture that looks pure but is evenly mixed is called a ________.
Solution
If lithium loses 1 electron, what is its new charge?
+1
Who first proposed the idea of “Atomos,” meaning uncuttable?
The Greeks
Potassium reacts violently with water but has what colored flame?
Purple flame
Convert 200°F to Celsius (nearest whole number).
~93 degrees Celsius
Salt (NaCl) is safe and stable, but its elements (Na & Cl) are dangerous. What does this show about compounds?
They have unique properties different from the elements within
What is the noble gas configuration shortcut for sodium?
[Ne]3s1