Chem A Flashcards
How many electrons are in the outer shell of any group 1 element?
1
what is an isotope?
an isotope is an atom that contains the same number of proton but different number of neutrons.
What group is a halogen?
Group 7
how many groups are there in the periodic table?
There are 8 groups in the periodic table.
What separation technique is used to separate salt and water?
Evaporation.
What is the positively charged atom in the nucleus?
Protons.
Who invented the periodic table?
Dmitri Mendeleev.
What 3 elements are magnetic?
Cobalt, Nickel and Iron.
What two elements make up table salt?
Sodium and Chloride.
What is distillation?
Distillation is a separation technique used to separate liquids with different boiling points.
Name some properties of group 0 elements?
They are single atoms, they all have low boiling points, they have low densities and they are poor conductors of heat and electricity.
What did Thomson’s plum pudding model suggest?
It suggested that the whole sphere is positively charged with negative electrons spread within it.
When did Mendeleev create the periodic table?
1869.
What noble gas is the most reactive?
Xenon.
Why are noble gases so unreactive?
The reason why noble gases are so unreactive is because they have a full outer shell so that they will gain or lose electrons.
Where are transition metals found in the periodic table?
Transition metals are found in the centre of the periodic table - between group 2 and 3 - with many uses.
Name three properties of the transition metals?
Any three from this:
1) Form coloured compounds.
2) Good conductors of heat and electricity.
3) Malleable and Ductile.
4) High melting points 9however mercury is a liquid at room temp).
5)Hard and strong.
6) High densities.
7) Can be used as catalysts.
8) They can lose different number of electron.
Name three properties of the group 1 metals?
Any three from this:
1) Silvery-coloured metals.
2) Soft.
3) Can be easily cut.
4) Shiny when cut quickly dulls.
5) Highly reactive metals.
6) The reactivity increases going down the group.
7) Low melting and boiling points.
8) Low densities.
What happens to the atoms as you go down group 1?
As you go down group 1 the atoms become larger and the outer electron is further from the nucleus.
Name the three main reactions about Alkali metals?
1) Alkali metals with water.
2) Alkali metals with oxygen.
3) Alkali metals with chlorine.
What is the chemical symbol for lithium?
Li.
What is the chemical symbol for Sodium?
Na.
What is the chemical symbol for Potassium?
K.
Name three properties of Halogens?
Any three from this:
1) Low melting and boiling points.
2) Increases down the group.
3) Group 7 is the only group which contains elements in all three states of matter.
4) Coloured metals.
5) Gets darker as you go down the group.
6) Diatomic Molecules.
7) Exists as two Atoms bonded together.
8) Poor conductors of heat and electricity.
9) Chemical reactivity decreases down the group.
What will a more reactive Halogen do?
A more reactive Halogen will displace a less reactive Halogen from a solution.
