Elements And The Periodic Table 20 Flashcards
Pb is an abbreviation for Latin word for lead
Plumbum
Horizontal row in periodic table called a
Period
Vertical column in periodic table called a
Group
Another word for group
Family
The structure of the table is based off
Mass
Groups have similar _ and _ properties
Physical
Chemical
Each element on left has one more proton and one more electron than
Element on right
Hydrogen has one electron, helium has two electrons, lithium has _ electrons
3
Atomic number tells you the number of _
Protons
If element is neutral, atomic number also tells you the number of
Electrons
To find the the number of neutrons in element
Subtract atomic number from mass number
When subtracting atomic number from mass number, you first have to
Round average atomic mass to nearest whole number
_ are atoms of the same element
Isotopes
Isotopes are
Atoms of the same element
_ is an isotope of carbon
Carbon-14
Isotopes always have the same number of protons with different
Atomic mass
More mass =
Heavier atoms
More neutrons =
More mass
Less neutrons means
Less mass
Less mass means
Lighter atoms
Example of an isotope
Carbon-14
Each isotope of an element is identified with
A mass number of
Mass number of isotope is the sum of (2)
Atomic number (protons)
Neutrons
Mass number = atomic number +
Number of neutrons
To write an isotope you must know (mn,an)
Mass number
Atomic number
To write an isotope, you must know (es,c)
Element symbol
Charge (if any)
