Vocabulary
Described "atoms" as "uncuttable"
What is Democritus
A period on the periodic table
What is each horizontal row
Isotopes have the same number of _____ but different numbers of _____
What is protons and neutrons
Said all elements are composed of atoms, and that atoms of the same element are identical.
What is Dalton
What is the group or family of the periodic table?
What is each vertical column
This is how you calculate the mass number for an atom
What is add protons and neutrons
Define Atom
What is the smallest particle of an element
How do you determine the number of neutrons in an element?
What is mass number-atomic number= number of neutrons
The reason electrons are not included when calculating the mass of an atom.
What is they are too small to change the mass in any significant way.
The particle that determines what type of atom it is.
What is proton
The name of group 7A on the periodic table
What is halogens?
The most abundant isotope of carbon
12C 13C 14C
12C because it mass is closest to the average atomic mass of carbon shown on the periodic table
Which subatomic particle has a larger mass, protons or neutrons?
What is neither, they both have nearly the same mass
What is number of protons and also number of electrons.
The name of the least reactive group of elements.
What is the Noble Gases
The average atomic mass of phonium, Ph if:
76Ph 22.5% abundance
77Ph 76.1% abundance
78Ph 1.4% abundance
What is 76.789 amu