Molecules & Atoms
What is a homogeneous diatomic molecule?
A molecule with 2 atoms of the same element
Which group of elements is the least reactive?
Nobel gasses
In which bond are atoms stolen?
Ionic bonds
How many Elements are in the periodic table?
118
How likely a substance is to react to/with another substance
Reactivity
What are out of balance atoms called?
Ions
What are the 4 most abundant elements in the human body?
Carbon, Nitrogen, Oxygen, and Hydrogen
Covalent bonds form between...
non-metals
How many of the Elements are found naturally?
95
What famous experiment did Ernest Rutherford conduct? What was the conclusion of this experiment?
He put a beam of alpha particles through gold foil. Some of the particles reflected back, but most went through the foil.
Molecules containing 2 or more atoms of the same element are...
Elemental
What purpose does the atomic number serve?
It is the number of protons in the atom
In which bond are electrons shared?
Covalent (molecular)
Who invented the periodic table?
Dimitri Mendeleev
Name 3 characteristics of metals
-conduct electricity
-usually solids
-are ductile
-are lustarlas
-are mable
What does 2H mean? What does H2 (with a smaller 2) mean?
2H means 2 hydrogen atoms. H2 means 1 hydrogen molecule and 2 hydrogen atoms.
How many rows and how many periods are there on the periodic table?
There are 18 rows and 7 periods
What are valance electrons and where are they in an atom?
Valance electrons are electrons which are shared and stolen and the live on the valence shell (the outermost shell)
Which two groups of elements are most reactive?
Alkali Metals and Halogens
What are Negatively charged ions called? What are positively charged ions called?
Negative charged ions are called anions. Positive ions are called cations.
Molecules with 2 ore more atoms from different molecules are...
Compound Molecules
Diamonds and Graphite are both made of...
Carbon
Ionic bonds form between...
metals and non-metals
What is a Lewis Diagram?
A dot diagram with one large dot as the nucleus and smaller dots surrounding it as electrons.
What formula is needed to calculate the maximum number of electrons per shell?
2(n squared) when n=number of shells