Atomic Structure And The Periodic Table Flashcards
(19 cards)
What side are the metals and non metals on in the periodic table
- metals left and center
- non metals right
What non metal elements exist as molecules that are made up of two atoms joined together
- iodine
- bromine
- chlorine
- fluorine
- oxygen
- nitrogen
- hydrogen
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What is a compound
Compounds contain two or more different element chemically combined in a fixed proportion
What is an element
- in an element, all the atoms are the same
What is an ion
A charged particle that forms when an atom or group of atoms lose or gain electrons
What form do word equations take place in
Reactants —> products
What is an isotope
- atoms of the same element that have different numbers of neutrons
Where are the mass numbers and atomic number
Mass top proton bottom
How do u find out number of neutrons
Mass - atomic
What is the relative atomic mass
- The average of the mass numbers of the different isotopes
- it is weighted for the abundance of each isotope (how common each isotope is)
What is the equation for relative atomic mass
Relative atomic mass=
(Mass of number of isotope one X percent abundance of isotope 1)
+
(mass of number of isotope 2 X percent abundance of isotope 2)
————————————————————————-
100
What do all atoms of an element have
The same number of protons
How did Dmitri Mendeleev create the modern periodic table
- he arranged all elements in order of increasing atomic weight
- he would switch the order of specific elements so they fitted the patterns of other elements in the same group
- he realised some elements hadn’t been discovered so left gaps in his periodic table where the undiscovered elements should be
Why did scientists think Mendeleevs table was correct
- Where he left gaps for the elements he thought hadn’t been discovered, he predicted the properties of the elements
- when they were discovered, the properties matched his descriptions
How are the elements arranged in the modern periodic table compared to Mendeleevs
- modern periodic table is in order of atomic number (the number of protons)
- Mendeleev ordered the elements by atomic weight - modern periodic table has group zero
- Mendeleev doesn’t have group zero
Why was there a problem with ordering by atomic weight
- the elements can appear in the wrong order due to the presence of isotopes
What are group one and two on the periodic table
Highly reactive metals (fat left)
What is in the centre of the periodic table
- The transition metals
- less reactive
What is group zero
- noble gases (far right)
- all have a full outer energy level which is why they are unreacfive
