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atomic structure and the periodic table (group 7 elements (Are you doing…
atomic structure and the periodic table
metals and non metals
Metals to the left of the product table don’t have many electrons to remove and metals towards the bottom of the product table have outer electrons which are a long way from the nucleus so feel a week at attraction birthdays affects mean that not much energy is needed to remove the electrons so it easy for the electrons to react to form positive ions with a full outer shell
For non-metals forming positive ions is much more difficult this is because they are either to the right of the product table where they have lots of electrons to remove to get to a full outer shell what was the top where the outer electrons are closer to the nucleus so feeling stronger attraction is far more easy for them to either share or gain electrons to get a full outer shell
Atoms generally reacts to form a full outer shell they do this via losing gaining or sharing electrons
group 1 elements
They all have one electron in the outer shell this makes them very reactive and gives them similar properties
Low melting and boiling points
The alkali metals are all soft and have low density the first three in the group are less dense than water
High relative atomic mass
The alkali metals are lithium sodium potassium rubidium caesium and francium
Increasing reactivity the outer electron is more easily lost as the attraction between the nucleus and the electron decreases because the lecturer is better away from the nucleus the further down the group you go
group 7 elements
Are you doing is it dark grey crystalline solid or purple vapour
They all exist as molecules which are part of atoms
Bromeini is a dense poisonous redbrown volatile liquid
Because less reactive it’s harder to gain And extra electron because the outer shells further from the nucleus
Clorane is a fairly reactive poisonous dense green gas
Have higher melting and boiling points
Fluorine is a very reactive poisonous yellow gas
Have higher relative atomic mass
group 0 elements
All elements in group 0 at colourless gases at room temperature
As a noble gases are in at the nonflammable
They exist as monatomic gases single atoms not bonded to each other
The boiling point of the noble gases increase as you move down the group along with an increase of relative atomic mass
They all have eight electrons in their outer energy level apart from helium which has to giving them a full outer shell as the outer shell is energetically stable they don’t need to give up organ electrons to become more stable this means they are more Or less in that they don’t react with much at all
The increase of boiling point is due to an increase in the number of electrons in the atom leading to greater intermolecular forces between them which need to be overcome
Group 0 elements are called the noble gases and include the element helium neon argon