Unit 2 Flashcards
What is an atom
The smallest unit of matter
What is a proton
Have positive charge located in the nucleus and determine the identity
What is a nuetron
Nuetral charge located in the nucleus and stabilizes the atom
What is an electron
Negative charge located in the outer shell and determines the reactivity of an atom
What is the total charge of an atom
Neutral
What is the atomic number equal to
Protons and electrons
Mass number is equal to
Atomic mass
What did Democritus say
Matter can not be divided infinitely
What did dalton say
Atom contains electrons
What did jj Thompson create
Plum pudding model
Why did Rutherford discover
Nucleus
What is mol
Si unit for material equality
What are valence electrons
The electrons in the outermost she’ll of an atom
How is the modern periodic table arranged
Increasing atomic number
Who developed the first periodic table
Mendeleev
Who developed the modern periodic table
Henry mosely
What is a group on the periodic table and what do they have in common
A vertical line; same number of electrons
What is a period on the periodic table
A horizontal line
Where are alkaline metals located
The first family
Why are noble gasses inert
They have full outermost
What are the two periods at the bottom of the table
Lanthanide, actinide
What are the most reactive metals
Alkaline
What is ionization energy
The amount of energy to form an ion
What happens to ionization energy
Increases
What happens to atomic radius
Decreases
