atoms

Question 1

atoms what do they contain

Answer 1

protons neutrons and electrons

Question 2

electrons what do they do

Answer 2

move around the nucleus in electron shells
negatively charged
they almost have no mass

Question 3

nucleus where are they and what do they do

Answer 3

middle of atom contains protons and neutrons
nucleus has radius of around 1 times 10 to the power of minus fourteen
has positive charge becuase of protons
almost whole of the mass is the nucleus

Question 4

relative charge and mass for the particles

Answer 4

protons mass = 1 but charge =+1
neutron mass= 1 nut charge = 0
electrons mass is very small and its charge =-1

Question 5

atomic number and mass number

Answer 5

atomic number=number of protons
mass number=number of protons + number of neutrons
number of neutrons = mass number-atomic number

Question 6

electrons charges

Answer 6

its the same size for charge on the protons but opposite so they cancel out
however if an ion the number of protons does not have an equal number of electrons meaning they have an overall charge
for example an ion with a charge of -2 has two more electrons than protons

positive ion =numberoff electrons=atomic number-charge

negative ion = number of electron = atomic number+charge