Topic 1 and 2 Flashcards
Who initially came up with the periodic table
Mendeleev came up with the strucutre
What charges and masses do each of sub atomic particles have?
Proton + 1
Electron - no mass
Neutron no charge 1
What does the group in the periodic table tell you
How many electrons are in the outer shell
How many electrons in the first shell?
2
What is an atomic number
It is the number of protons in an atom
What is the atomic mass
It is the relative weight of the atom or the jumble of protons and neutrons
What is an isotope
An atom that h the same number of protons but a different number of neutrons this gives the atom a different mass number
How do you work out the relative atomic mass
You need to find the percent that each of the isotopes come up times that by the atomic mass then add together the answer. This will give you the average of the atomic mass
Why was Mendeleev’s table so advanced
He left spaces in his table for elements that hadn’t been found based on predicted properties
What does the period of the periodic table tell you
The number of electron shells
How can ionic bonding be described
As the transfer of electrons to form negatively and positively charged ions these attract to form a lattice
Why are group 1 elements so reactive
They only contain one electron in the outer shell meaning they want to remove it to gain a full outer shell
What do ionic bonds form
Ionic compounds which have similar structures, the structure is a closely packed lattice arrangement
What are the properties of ionic compounds
They have high melting and booing points due to very strong bonds between the ions, lots of energy is needed to break these. They conduct electricity when aqueous or molten because the ions separate and are free to move.
How can you work out the formula of an ionic compound?
Look at the charges of the ions, you need to make the charges balance out and become neutral.
