CH.1 Atomic Structure and the Periodic Table Flashcards
Atoms, elements and compounds / Mixtures / History of the atom / Charges / Size and mass of atoms / RAM / Electronic Strucutre / Periodic table / Metals and non-metals / Group 0, 1 and 7 / Comparing groups
What is the charge of a proton?
+1
What is the charge of a neutron?
0
What is the charge of an electron?
-1
What is the overall charge of an atom?
0 , neutral
What is an atom?
The smallest part of an element that exists.
What do chemical reactions always involve?
The formation of one or more substances, and a detectable energy change.
What is a compound?
Two or more elements chemically joined together to form a new substance.
How to find the mass number?
Add together the number of protons and neutrons.
How to find the number of neutrons in an atom?
number of neutrons = mass number - atomic number
On the periodic table what does the number above the letter represent?
Mass number
On the periodic table what does the number below the letter represent?
Atomic number
What is a molecule?
A particle that consists of two or more atoms chemically bonded together.
What is a molecule of an element?
Two or more of the same atoms joined together.
What is a molecule of a compound?
Two or more of different atoms joined together.
What is an isotope?
Isotopes are atoms with the same number of protons, but different number of neutrons.
Isotopes have the same atominc number, but different mass numbers.
Approximately how many elements are there?
Approximately 100
What is the relative atomic mass?
The average mass of all isotopes of an element, considering the abundance and mass number of each isotope.
How to calculate Relative Atomic Mass?
RAM = Sum of: (isotope abundance x isotope mass number) / sum of abundances of all isotopes.
What is a mixture?
A group of different elements or compounds that are not chemically joined together.
