4-1
4-2
4-3
Leftovers
More Leftovers
100
What is the smallest particle of an element that retains its identity in a chemical reaction?
Atom
100
Fill in the blank: Atoms can be broken down into ______
particles
100
What is the atomic number?
Number of protons (also number of electrons)
100
What is the Atomic Mass Unit (amu)?
1/12 the mass of a carbon-12 atom
100
What does the name of a group contain?
A number and a letter
200
Who believed that atoms were indivisible and indestructible?
Democritus
200
Which subatomic particle is negatively charged with a mass of 0?
Electron e-
200
What is the mass number?
Total number of protons and neutrons (MN=p+ + n0)
200
What is the weighted average mass of the atoms in a naturally occuring sample of the element?
Atomic Mass
200
What is another name for a "group" on the periodic table?
Family
300
Which theory says that all elements are composed of tiny indivisible particles called atoms?
Dalton's atomic theory
300
Which subatomic particle is positively charged with a mass of 1?
Proton p+
300
Charts for atoms include: (name at least 3)
Elements, Symbols, Mass Number, Atomic Number, Number of protons, Number of Neutrons, Number of Electrons
300
Why are atoms electrically neutral?
the number of protons equals the number of electrons (# of p+=# of e-)
300
What is a horizontal row on the periodic table called?
Period
400
Fill in the blanks: Atoms of different elements can physically ____ ______ or _______ ______ to form compounds.
mix together or chemically combine
400
Which subatomic particle is nuetrally charged with a mass of 1?
Neutron n0
400
What are isotopes?
Atoms that have the same number of protons but a different number of neutrons.
400
How is atomic mass calculated?
mass of isotope x natural abundance
400
What are the verticle columns in the periodic table called?
Groups
500
Fill in the blank: ______ reactions occur when atoms are seperated, joined, or rearranged.
Chemical
500
What is the central core of an atom composed of protons and neutrons with an overall positive charge?
Nucleus
500
How to isotopes differ from elements? (all three!)
Mass Number, Number of neutrons, Name/Symbol
500
What is the arrangement of elements in which the elements are seperated into groups based on a set of properties?
Periodic Table
500
Which part of Dalton's Theory is incorrect?
Atoms are indivisible
M
e
n
u