Atomic Theories
He proposed the first atomic theory
Who is Dalton
The three subatomic particles
What are protons, neutrons, and electrons
The amount of groups in the periodic table
What is 18
What is the formula for water?
What is H₂O
What is the charge of a neutron?
What is Neutral
This experiment led to the discovery of electrons
What are Cathode Ray Tube Experiments
Which subatomic particle has a negative charge?
What are electrons
What do elements in the same group have in common?
Same number of valence electrons
What is an isotope?
Atoms of the same element with different numbers of neutrons
What state of matter are most metals at room temperature?
What is solid
Rutherford's gold foil experiment proved
Atoms have a dense, positively charged nucleus
Where are protons and neutrons located?
Inside the nucleus
What are the two most abundant elements in Earth’s crust?
What is silicon and oxygen
What is the difference between an element symbol and a chemical formula?
Element symbols represent single elements; chemical formulas show how elements combine
What is the hydrosphere?
What are the bodies of water on Earth
How did Bohr modify Rutherford’s model?
He introduced electron shells
What is the mass of a proton and a neutron?
1 atomic mass unit each
Which group contains the most reactive metals?
What are alkali metals (group 1)
How many oxygen atoms are in glucose?
What is 6
What are the three categories of elements?
List the four postulates of Dalton’s Atomic Theory
Matter is made of atoms, atoms cannot be destroyed, atoms of an element are identical, compounds form in definite proportions
How is the atomic number related to protons and electrons?
Atomic number = number of protons = number of electrons in a neutral atom
Why are noble gases unreactive?
They have full valence electron shells
This is the total number of atoms in two molecules of glucose
What is 48
What element has the symbol Xe?
What is Xenon