Elements Flashcards
Atomic Structure and the Periodic Table (20 cards)
What determines the type of atom?
The number of protons in the nucleus
What is hydrogen’s atomic structure?
1 proton in its nucleus
What is helium’s atomic structure?
2 protons in its nucleus
What is a substance called that contains only atoms with the same number of protons?
Element
How many different elements are there approximately?
About 100
What do all atoms of a particular element have in common?
The same number of protons
How are atoms represented in shorthand?
By one or two letter symbols
What is the symbol for carbon?
C
What is the symbol for oxygen?
O
What is the symbol for sodium?
Na
What is the symbol for iron?
Fe
What are isotopes?
Different forms of the same element with the same number of protons but different numbers of neutrons
What do isotopes have in common?
The same atomic number
What is a popular example of isotopes?
Carbon-12 and Carbon-13
How many protons does Carbon-12 have?
6 protons
How many neutrons does Carbon-13 have?
7 neutrons
What is relative atomic mass?
An average mass taking into account the different masses and abundances of all isotopes
What formula is used to calculate relative atomic mass?
sum of (isotope abundance X isotope mass number) / sum of abundances of all isotopes
How do you calculate the relative atomic mass of copper given its isotopes?
Relative atomic mass = (69.2x63) + (30.8x65) / (69.2 + 30.8)
What is the relative atomic mass of copper to one decimal place?
63.6
