exit tickets

Question 1

the atomic number of an atom is the number of..

Answer 1

protons

Question 2

the mass number of an atom is the number of.. and ..

Answer 2

protons and neutrons

Question 3

explain why an atom has no overall charge. use the relative electrical charges of sub-atomic particles in your explanation.

Answer 3

when the protons and electrons are equal, they cancel eachother out

Question 4

give the meaning of ‘isotopes’. you should answer in terms of sub-atomic particles.

Answer 4

atoms of the same element with a different amounts of neutrons but the same number of protons

Question 5

what are group 1 elements known as?

Answer 5

alkali metals

Question 6

explain why group 0 elements are monatomic?

Answer 6

this is because they have full outer shells causing them to be unreactive.

Question 7

explain why ionic compounds can conduct electricity when molten but not solid

Answer 7

•the giant lattice is broken so the ions are free to move (delocalised ions). •ions can carry charge.
•ions in solids can only vibrate.

Question 8

explain why diamond has a high melting point.

Answer 8

•diamond is an example of a giant covalent structure.
•it is held together by many strong covalent bonds
•large structures will have more intermolecular forces which require more energy to break.