Electron theory

Question 1

what makes up an atom

Answer 1

protons, neutrons and electrons

Question 2

what is the charge of an electron?

Answer 2

1.602 x 10^19 C

Question 3

what is a cation and an anion? and how are they made

Answer 3

a cation is a positively charged Atom, made by an atom losing an electron, an anion is a negatively charged particle, created by an electron gaining an electron

Question 4

how does ionisation occur?

Answer 4

can be created by physical or chemical means, such as dissolving a salt in water or passing a direct current in a conducting solution, which dissolves the anode,

Question 5

what is a conductor

Answer 5

metal atom that usually has 4 electrons in its outer shell, easily conducts electricity through its lattice structure giving it high electron mobility.

Question 6

examples of conductive metals

Answer 6

copper, aluminium and silver

Question 7

name two semiconductors

Answer 7

silicon, germanium

Question 8

what are semiconductors?

Answer 8

between good conductors and insulators, generally have 1 free electron per million atoms, but are better conductors at higher temperatures,

Question 9

where are semiconductors on the periodic table?

Answer 9

between metals and non metals

Question 10

what is an insulator

Answer 10

non-conductors, tightly packed molecules with no free electrons, usually have more then 4 electrons in their valence orbit

Question 11

examples of insulators

Answer 11

mica, porcelain